Measurement Report

97

Kent Microsoft

Test Report SAR

Compucase Enterprise Co., Ltd. 500WHRX OMNES Essential Gaming Headset 2ARWD-500WHRX 2ARWD500WHRX 500whrx

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Document DEVICE REPORTGetApplicationAttachment.html?id=5980111
Report No.: BTL-FCC SAR-1-2112C154
FCC SAR Test Report

FCC ID: 2ARWD-500WHRX

Project No. Equipment Brand Name Test Model Series Model Date of Receipt Date of Test Issued Date Report Version Test Sample Standard(s) Applicant Address Manufacturer Address Factory Address

: 2112C154 : OMNES Essential Gaming Headset : COUGAR : CGR-G53B-500WH, CGR-G53E-500WH : CGR-G53X-500WH (X can be A~Z) : Mar. 10, 2022 : May 20, 2022 : Jun. 17, 2022 : R00 : Engineering Sample No.: DG2022040218. : Please refer to page 2. : Compucase Enterprise Co.,Ltd. : No.225,Lane 54,AN HO Road,Sec.2,Tainan,Taiwan : Compucase Enterprise Co.,Ltd. : No.225,Lane 54,AN HO Road,Sec.2,Tainan,Taiwan
Pan Chang Enterprise Co.,Ltd.
HeWuJi Industrial District,SiJia Village ,ShiJie Town,DongGuan
City,GuanDong Province ,China

The above equipment has been tested and found compliance with the requirement of the relative standards by BTL Inc.

Prepared by : Seven Lu Approved by : Herbort Liu

Add: No. 3 Jinshagang 1st Rd. Shixia, Dalang Town Dongguan City, Guangdong 523792 People's Republic of China Tel: +86-769-8318-3000 Web: www.newbtl.com
Page 1 of 27

Standard(s)

Report No.: BTL-FCC SAR-1-2112C154
: FCC 47CFR §2.1093 Radio frequency Radiation Exposure Evaluation: Portable Devices
ANSI Std C95.1-1992 Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz - 300 GHz. (IEEE Std C95.1-1991)
IEEE Std 1528-2013 Recommended Practice for Determining the Peak Spatial-Average Specific Absorption Rate (SAR) in the Human Head from Wireless Communications Devices: Measurement Techniques
KDB447498 D04 Interim General RF Exposure Guidance v01 KDB248227 D01 802.11 Wi-Fi SAR v02r02 KDB865664 D01 SAR measurement 100 MHz to 6 GHz v01r04 KDB865664 D02 RF Exposure Reporting v01r02 KDB690783 D01 SAR Listings on Grants v01r03

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Report No.: BTL-FCC SAR-1-2112C154
Declaration BTL represents to the client that testing is done in accordance with standard procedures as applicable and that test instruments used has been calibrated with standards traceable to international standard(s) and/or national standard(s). BTL's reports apply only to the specific samples tested under conditions. It is manufacture's responsibility to ensure that additional production units of this model are manufactured with the identical electrical and mechanical components. BTL shall have no liability for any declarations, inferences or generalizations drawn by the client or others from BTL issued reports. The report must not be used by the client to claim product certification, approval, or endorsement by NIST, A2LA, or any agency of the U.S. Government. This report is the confidential property of the client. As a mutual protection to the clients, the public and ourselves, the test report shall not be reproduced, except in full, without our written approval. BTL's laboratory quality assurance procedures are in compliance with the ISO/IEC 17025 requirements, and accredited by the conformity assessment authorities listed in this test report. BTL is not responsible for the sampling stage, so the results only apply to the sample as received. The information, data and test plan are provided by manufacturer which may affect the validity of results, so it is manufacturer's responsibility to ensure that the apparatus meets the essential requirements of applied standards and in all the possible configurations as representative of its intended use. Limitation For the use of the authority's logo is limited unless the Test Standard(s)/Scope(s)/Item(s) mentioned in this test report is (are) included in the conformity assessment authorities acceptance respective. Please note that the measurement uncertainty is provided for informational purpose only and are not use in determining the Pass/Fail results.
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Report No.: BTL-FCC SAR-1-2112C154

Table of Contents

Page

REPORT ISSUED HISTORY

6

1 . GENERAL INFORMATION

7

1.1 STATEMENT OF COMPLIANCE

7

1.2 LABORATORY ENVIRONMENT

7

1.3 GENERAL DESCRIPTION OF EUT

7

1.4 MAIN TEST INSTRUMENTS

8

2 . RF EMISSIONS MEASUREMENT

9

2.1 TEST FACILITY

9

2.2 MEASUREMENT UNCERTAINTY

9

3 . SAR MEASUREMENTS SYSTEM CONFIGURATION

10

3.1 SAR MEASUREMENT SET-UP

10

3.1.1 TEST SETUP LAYOUT

10

3.2 DASY5 E-FIELD PROBE SYSTEM

11

3.2.1 PROBE SPECIFICATION

11

3.2.2 E-FIELD PROBE CALIBRATION

12

3.2.3 OTHER TEST EQUIPMENT

13

3.2.4 SCANNING PROCEDURE

14

3.2.5 SPATIAL PEAK SAR EVALUATION

15

3.2.6 DATA STORAGE AND EVALUATION

16

4 . SYSTEM VERIFICATION PROCEDURE

19

4.1 TISSUE VERIFICATION

19

4.2 SYSTEM CHECK

20

4.3 SYSTEM CHECK PROCEDURE

20

5 . SAR MEASUREMENT VARIABILITY AND UNCERTAINTY

21

5.1 SAR MEASUREMENT VARIABILITY

21

6 . OPERATIONAL CONDITIONS DURING TEST

22

6.1 TEST POSITION

22

7 . TEST RESULT

23

7.1 CONDUCTED POWER RESULT

23

7.1.1 CONDUCTED POWER MEASUREMENTS

23

7.2 . SAR TEST RESULTS

24

7.2.1 SAR MEASUREMENT RESULT

24

8 . SIMULTANEOUS TRANSMISSION CONDITIONS

25

APPENDIX

26

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Table of Contents
1. TEST LAYOUT Appendix A. SAR Plots of System Verification Appendix B. SAR Plots of SAR Measurement Appendix C. Calibration Certificate Appendix D. Photographs of the Test Set-Up

Report No.: BTL-FCC SAR-1-2112C154
Page
26

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Report No.: BTL-FCC SAR-1-2112C154

REPORT ISSUED HISTORY

Report No. BTL-FCC SAR-1-2112C154

Version R00

Description Original Report.

Issued Date Jun. 17, 2022

Note Valid

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1. GENERAL INFORMATION 1.1 STATEMENT OF COMPLIANCE

Report No.: BTL-FCC SAR-1-2112C154

Mode 2.4G SRD

Highest Reported Head SAR-1g (W/kg)
0.002

Note: The device is tested according to Specific Absorption Rate (SAR) for general population/ uncontrolled exposure limits according to the FCC rule §2.1093, the ANSI/IEEE C95.1:1992, the NCRP Report Number 86 for uncontrolled environment, and had been tested in accordance with the measurement methods and procedures specified in IEEE Std 1528-2013.

1.2 LABORATORY ENVIRONMENT

Temperature

Min. = 20ºC, Max. = 24ºC

Relative humidity

Min. = 30%, Max. = 70%

Ground system resistance

< 0.5

Ambient noise is checked and found very low and in compliance with requirement of standards. Reflection of surrounding objects is minimized and in compliance with requirement of standards.

1.3 GENERAL DESCRIPTION OF EUT

Equipment

OMNES Essential Gaming Headset

Brand Name COUGAR

Test Model

CGR-G53B-500WH, CGR-G53E-500WH

Series Model CGR-G53X-500WH (X can be A~Z)

Model Difference(s) Only differ in marketing area.

Modulation

GFSK

Operation Frequency Range(s)

Band 2.4G SRD

Test Channels (low-mid-high)

1-37-76 (2.4G SRD)

Antenna Gain (dBi) 3.0

TX (MHz) 2400~2483.5

Other Information

Battery

Model Name Power Rating

454260 DC 3.7V, 1300mAh, 4.81Wh

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Report No.: BTL-FCC SAR-1-2112C154

1.4 MAIN TEST INSTRUMENTS

Item

Equipment

Manufacturer

1 Data Acquisition Electronics Speag

Model DAE4

Serial No. 1390

Cal. Date Cal. Interval Dec. 29, 2021 1 Year

2

E-field Probe

Speag

EX3DV4

7693

Nov. 03, 2021 1 Year

3 System Validation Dipole

Speag

D2450V2

919

May 28, 2021 3 Years

4

Twin Sam Phantom

Speag

Twin Sam Phantom V5.0

1469

N/A

N/A

5

Power Amplifier

Mini-Circuits ZHL-42W+

QA1333003 Dec. 26, 2021 1 Year

6

DC Source metter

lteck

IT6154

0061041267682 01001

Jul. 24, 2021

1 Year

7

Signal Analyzer

R&S

FSV7

103120

Jul. 10, 2021 1 Year

8 Vector Network Analyzer

Agilent

E5071C

MY46102965 Feb. 19, 2022 1 Year

9

Signal Generator

Agilent

N5172B

MY53050758 Feb. 19, 2022 1 Year

10

Smart Power Sensor

11

3.5mm Economy Calibration Kit

12 Dielectric Assessment Kit

R&S Agilent Speag

NRP-Z21 85052D DAK-3.5

102209

Feb. 19, 2022

MY43252246 Dec. 14, 2021

1226

N/A

1 Year 1 Year
N/A

13

Directional Coupler

Woken

TS-PCC0M-05 0107090019 Feb. 19, 2022 1 Year

14

Coupler

Woken 0110A05601O-10 COM5BNW1A2 Feb. 19, 2022 1 Year

15

Digital Themometer

TES

TES-1310

210706071 Dec. 07, 2021 1 Year

Note: 1. "N/A" denotes no model name, serial No. or calibration specified. 2. 1) Per KDB865664 D01 requirements for dipole calibration, the test laboratory has adopted three-year extended
calibration interval. Each measured dipole is expected to evaluate with the following criteria at least on annual interval in Appendix C. a) There is no physical damage on the dipole; b) System check with specific dipole is within 10% of calibrated value; c) The most recent return-loss result, measured at least annually, deviates by no more than 20% from the previous measurement; d) The most recent measurement of the real or imaginary parts of the impedance, measured at least annually is within 5 from the previous measurement. 2) Network analyzer probe calibration against air, distilled water and a short block performed before measuring liquid parameters.

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Report No.: BTL-FCC SAR-1-2112C154
2. RF EMISSIONS MEASUREMENT 2.1 TEST FACILITY
The test facilities used to collect the test data in this report is SAR room at the location of Room 108, Building 2, No.1, Yile Road, Songshan Lake Zone, Dongguan City, Guangdong, People's Republic of China. BTL's Designation Number for FCC: CN1240.
2.2 MEASUREMENT UNCERTAINTY
Note: Per KDB865664 D01 SAR Measurement 100 MHz to 6 GHz v01r04, when the highest measured 1-g SAR within a frequency band is < 1.5 W/kg, the extensive SAR measurement uncertainty analysis described in IEEE Std 1528-2013 is not required in SAR reports submitted for equipment approval. The equivalent ratio (1.5/1.6) is applied to extremity and occupational exposure conditions.
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Report No.: BTL-FCC SAR-1-2112C154
3. SAR MEASUREMENTS SYSTEM CONFIGURATION 3.1 SAR MEASUREMENT SET-UP
The DASY5 system for performing compliance tests consists of the following items: 1. A standard high precision 6-axis robot (Stäubli RX family) with controller and software. An arm extension for
accommodating the data acquisition electronics (DAE). 2. A dosimetric probe, i.e. an isotropic E-field probe optimized and calibrated for usage in tissue simulating
liquid. The probe is equipped with an optical surface detector system. 3. A data acquisition electronic (DAE) which performs the signal amplification, signal multiplexing,
AD-conversion, offset measurements, mechanical surface detection, collision detection, etc. The unit is battery powered with standard or rechargeable batteries. The signal is optically transmitted to the EOC. 4. A unit to operate the optical surface detector which is connected to the EOC. 5. The Electro-Optical Coupler (EOC) performs the conversion from the optical into a digital electric signal of the DAE. The EOC is connected to the DASY5 measurement server. 6. TheDASY5 measurement server, which performs all real-time data evaluation for field measurements and surface detection, controls robot movements and handles safety operation. A computer operating Windows. 7. DASY5 software and SEMCAD data evaluation software. 8. Remote control with teach panel and additional circuitry for robot safety such as warning lamps, etc. 9. The generic twin phantom enabling the testing of left-hand and right-hand usage. 10. The device holder for handheld mobile phones. 11. Tissue simulating liquid mixed according to the given recipes. 12. System validation dipoles allowing to validate the proper functioning of the system.
3.1.1 TEST SETUP LAYOUT
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Report No.: BTL-FCC SAR-1-2112C154

3.2 DASY5 E-FIELD PROBE SYSTEM

The SAR measurements were conducted with the dosimetric probe EX3DV4 (manufactured by SPEAG), designed in the classical triangular configuration and optimized for dosimetric evaluation.

3.2.1 PROBE SPECIFICATION

EX3DV4 Construction Calibration Frequency Directivity Dynamic Range
Dimensions

Symmetrical design with triangular core Interleaved sensors Built-in shielding against static charges PEEK enclosure material (resistant to organic solvents, e.g., DGBE)
ISO/IEC 17025 calibration service available
10 MHz to 6 GHz Linearity: ± 0.2 dB (30 MHz to 6 GHz)
± 0.3 dB in HSL (rotation around probe axis) ± 0.5 dB in tissue material (rotation normal to probe axis) 10 µW/g to > 100 mW/g Linearity: ± 0.2dB Overall length: 330 mm (Tip: 20 mm) Tip diameter: 2.5 mm (Body: 12 mm) Distance from probe tip to dipole centers: 1.0 mm

E-field Probe

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Report No.: BTL-FCC SAR-1-2112C154
3.2.2 E-FIELD PROBE CALIBRATION
Each probe is calibrated according to a dosimetric assessment procedure with accuracy better than ±10%. The spherical isotropy was evaluated and found to be better than ± 0.25dB. The sensitivity parameters (NormX, NormY, NormZ), the diode compression parameter (DCP) and the conversion factor (ConvF) of the probe are tested. The free space E-field from amplified probe outputs is determined in a test chamber. This is performed in a TEM cell for frequencies bellow 1 GHz, and in a wave guide above 1 GHz for free space. For the free space calibration, the probe is placed in the volumetric center of the cavity and at the proper orientation with the field. The probe is then rotated 360 degrees. E-field temperature correlation calibration is performed in a flat phantom filled with the appropriate simulated brain tissue. The measured free space E-field in the medium correlates to temperature rise in a dielectric medium. For temperature correlation calibration a RF transparent thermistor-based temperature probe is used in conjunction with the E-field probe.
Where: t = Exposure time (30 seconds), C = Heat capacity of tissue (brain or muscle), T = Temperature increase due to RF exposure.
Or Where:  = Simulated tissue conductivity,  = Tissue density (kg/m3).
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Report No.: BTL-FCC SAR-1-2112C154

3.2.3 OTHER TEST EQUIPMENT

3.2.3.1 Device Holder for Transmitters
Construction: Simple but effective and easy-to-use extension for Mounting Device that facilitates the testing of larger devices (e.g., laptops, cameras, etc.) It is light weight and fits easily on the upper part of the Mounting Device in place of the phone positioner. The extension is fully compatible with the Twin SAM, ELI and SAM v6.0 Phantoms. Material: POM, Acrylic glass, Foam

3.2.3.2 Phantom
Model Construction
Shell Thickness Filling Volume Dimensions Aailable

Twin SAM
The shell corresponds to the specifications of the Specific Anthropomorphic Mannequin (SAM) phantom defined in IEEE 1528 and IEC 62209-1. It enables the dosimetric evaluation of left and right hand phone usage as well as body mounted usage at the flat phantom region. A cover prevents evaporation of the liquid. Reference markings on the phantom allow the complete setup of all predefined phantom positions and measurement grids by teaching three points with the robot.
2 ± 0.2 mm
Approx. 25 liters
Length:1000mm; Width: 500mm Height: adjustable feet
Special

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Report No.: BTL-FCC SAR-1-2112C154
3.2.4 SCANNING PROCEDURE
The DASY5 installation includes predefined files with recommended procedures for measurements and validation. They are read-only document files and destined as fully defined but unmeasured masks. All test positions (head or Body) are tested with the same configuration of test steps differing only in the grid definition for the different test positions.
The "reference" and "drift" measurements are located at the beginning and end of the batch process. They measure the field drift at one single point in the liquid over the complete procedure. The indicated drift is mainly the variation of the DUT's output power and should vary max. ± 5 %.
The "surface check" measurement tests the optical surface detection system of the DASY5 system by repeatedly detecting the surface with the optical and mechanical surface detector and comparing the results. The output gives the detecting heights of both systems, the difference between the two systems and the standard deviation of the detection repeatability. Air bubbles or refraction in the liquid due to separation of the sugar-water mixture gives poor repeatability (above ± 0.1mm). To prevent wrong results tests are only executed when the liquid is free of air bubbles. The difference between the optical surface detection and the actual surface depends on the probe and is specified with each probe. (It does not depend on the surface reflectivity or the probe angle to the surface within ± 30°.)  Area Scan
The "area scan" measures the SAR above the DUT or verification dipole on a parallel plane to the surface. It is used to locate the approximate location of the peak SAR with 2D spline interpolation. The robot performs a stepped movement along one grid axis while the local electrical field strength is measured by the probe. The probe is touching the surface of the SAM during acquisition of measurement values. The standard scan uses large grid spacing for faster measurement. Standard grid spacing for head measurements is 15 mm in x- and y- dimension (2GHz), 12 mm in x- and y- dimension (2-4 GHz) and 10mm in x- and y- dimension (4-6GHz). If a finer resolution is needed, the grid spacing can be reduced. Grid spacing and orientation have no influence on the SAR result. For special applications where the standard scan method does not find the peak SAR within the grid, e.g. mobile phones with flip cover, the grid can be adapted in orientation.  Zoom Scan
A "zoom scan" measures the field in a volume around the 2D peak SAR value acquired in the previous "coarse" scan. This is a fine grid with maximum scan spatial resolution: xzoom, yzoom2GHz -8mm, 2-4GHz -5 mm and 4-6 GHz-4mm; zzoom3GHz -5 mm, 3-4 GHz-4mm and 4-6GHz-2mm where the robot additionally moves the probe along the z-axis away from the bottom of the Phantom. DASY is also able to perform repeated zoom scans if more than 1 peak is found during area scan. In this document, the evaluated peak 1g and 10g averaged SAR values are shown in the 2D-graphics in Appendix B. Test results relevant for the specified standard (see chapter 1.4.) are shown in table form in chapter 7.2.
A Z-axis scan measures the total SAR value at the x-and y-position of the maximum SAR value found during the cube scan. The probe is moved away in z-direction from the bottom of the SAM phantom in 2 mm steps. This measurement shows the continuity of the liquid and can - depending in the field strength ­ also show the liquid depth.
The following table summarizes the area scan and zoom scan resolutions per FCC KDB 865664D01:
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Report No.: BTL-FCC SAR-1-2112C154
3.2.5 SPATIAL PEAK SAR EVALUATION
The spatial peak SAR - value for 1 and 10 g is evaluated after the Cube measurements have been done. The basis of the evaluation are the SAR values measured at the points of the fine cube grid consisting of 5 x 5 x 7 points (with 8mm horizontal resolution) or 7 x 7 x 7 points (with 5mm horizontal resolution) or 8 x 8 x 7 points (with 4mm horizontal resolution). The algorithm that finds the maximal averaged volume is separated into three different stages.  The data between the dipole center of the probe and the surface of the phantom are extrapolated. This data
cannot be measured since the center of the dipole is 2.7 mm away from the tip of the probe and the distance between the surface and the lowest measuring point is about 1 mm (see probe calibration sheet). The extrapolated data from a cube measurement can be visualized by selecting "Graph Evaluated".  The maximum interpolated value is searched with a straight-forward algorithm. Around this maximum the SAR - values averaged over the spatial volumes (1g or 10 g) are computed using the 3d-spline interpolation algorithm. If the volume cannot be evaluated (i.e., if a part of the grid was cut off by the boundary of the measurement area) the evaluation will be started on the corners of the bottom plane of the cube.  All neighboring volumes are evaluated until no neighboring volume with a higher average value is found. Extrapolation The extrapolation is based on a least square algorithm [W. Gander, Computer mathematic, p.168-180]. Through the points in the first 3 cm along the z-axis, polynomials of order four are calculated. These polynomials are then used to evaluate the points between the surface and the probe tip. The points, calculated from the surface, have a distance of 1 mm from each other. Interpolation The interpolation of the points is done with a 3d-Spline. The 3d-Spline is composed of three one-dimensional splines with the "Not a knot"-condition [W. Gander, Computer mathematic, p.141-150] (x, y and z -direction) [Numerical Recipes in C, Second Edition, p.123ff ]. Volume Averaging At First the size of the cube is calculated. Then the volume is integrated with the trapezoidal algorithm. 8000 points (20x20x20) are interpolated to calculate the average. Advanced Extrapolation DASY5 uses the advanced extrapolation option which is able to compensate boundary effects on E-field probes.
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Report No.: BTL-FCC SAR-1-2112C154
3.2.6 DATA STORAGE AND EVALUATION 3.2.6.1 Data Storage
The DASY5 software stores the acquired data from the data acquisition electronics as raw data (in microvolt readings from the probe sensors), together with all necessary software parameters for the data evaluation (probe calibration data, liquid parameters and device frequency and modulation data) in measurement files with the extension "DAE". The software evaluates the desired unit and format for output each time the data is visualized or exported. This allows verification of the complete software setup even after the measurement and allows correction of incorrect parameter settings. For example, if a measurement has been performed with a wrong crest factor parameter in the device setup, the parameter can be corrected afterwards and the data can be re-evaluated. The measured data can be visualized or exported in different units or formats, depending on the selected probe type ([V/m], [A/m], [°C], [mW/g], [mW/cm²], [dBrel], etc.). Some of these units are not available in certain situations or show meaningless results, e.g., a SAR output in a lossless media will always be zero. Raw data can also be exported to perform the evaluation with other software packages.
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Report No.: BTL-FCC SAR-1-2112C154
3.2.6.2 Data Evaluation by SEMCAD
The SEMCAD software automatically executes the following procedures to calculate the field units from the microvolt readings at the probe connector. The parameters used in the evaluation are stored in the configuration modules of the software:

Probe parameters:

Sensitivity Conversion factor Diode compression point

Device parameters: Frequency Crest factor

Normi, ai0, ai1, ai2 ConvFi Dcpi
f cf

Media parameters:

Conductivity Density

These parameters must be set correctly in the software. They can be found in the component documents or they can be imported into the software from the configuration files issued for the DASY5 components. In the direct measuring mode of the multi meter option, the parameters of the actual system setup are used. In the scan visualization and export modes, the parameters stored in the corresponding document files are used.
The first step of the evaluation is a linearization of the filtered input signal to account for the compression characteristics of the detector diode. The compensation depends on the input signal, the diode type and the DC-transmission factor from the diode to the evaluation electronics.

If the exciting field is pulsed, the crest factor of the signal must be known to correctly compensate for peak power. The formula for each channel can be given as:
Vi = Ui + Ui2 · cf / dcpi

With

Vi = compensated signal of channel i Ui = input signal of channel i cf = crest factor of exciting field dcpi = diode compression point

( i = x, y, z ) ( i = x, y, z )
(DASY parameter) (DASY parameter)

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Report No.: BTL-FCC SAR-1-2112C154
From the compensated input signals the primary field data for each channel can be evaluated:
E-field probes: Ei = ( Vi / Normi · ConvF )1/2
H-field probes: Hi = ( Vi )1/2 · ( ai0 + ai1 f + ai2f2 ) / f

With

Vi = compensated signal of channel i Normi = sensor sensitivity of channel i
[mV/(V/m)2] for E-field Probes ConvF = sensitivity enhancement in solution
aij = sensor sensitivity factors for H-field probes
f = carrier frequency [GHz] Ei = electric field strength of channel i in V/m Hi = magnetic field strength of channel i in A/m

( i = x, y, z ) ( i = x, y, z )

The RSS value of the field components gives the total field strength (Hermitian magnitude): Etot = (EX2+ EY2+ EZ2)1/2
The primary field data are used to calculate the derived field units. SAR = (Etot) 2 ·  / (· 1000)

With

SAR = local specific absorption rate in mW/g
Etot = total field strength in V/m = conductivity in [mho/m] or [Siemens/m] = equivalent tissue density in g/cm3

Note that the density is normally set to 1 (or 1.06), to account for actual brain density rather than the density of the simulation liquid. The power flow density is calculated assuming the excitation field to be a free space field.
Ppwe = Etot2 / 3770 or Ppwe = Htot2 · 37.7

With

Ppwe = equivalent power density of a plane wave in mW/cm2
Etot = total field strength in V/m Htot = total magnetic field strength in A/m

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Report No.: BTL-FCC SAR-1-2112C154

4. SYSTEM VERIFICATION PROCEDURE

4.1 TISSUE VERIFICATION

The simulating liquids should be checked at the beginning of a series of SAR measurements to determine of the dielectic parameter are within the tolerances of the specified target values. The measured conductivity and relative permittivity should be within ± 5% of the target values.

The following materials are used for producing the tissue-equivalent materials.

Tissue Type Head 2450

Bactericide -

DGBE 45.0

HEC NaCl

-

0.1

Sucrose -

Triton X-100
-

Water 54.9

Diethylene Glycol Mono-
hexylether -

Salt: 99+% Pure Sodium Chloride; Sugar: 98+% Pure Sucrose; Water: De-ionized, 16M + resistivity HEC: Hydroxyethyl Cellulose; DGBE: 99+% Di(ethylene glycol) butyl ether,[2-(2-butoxyethoxy)ethanol] Triton X-100(ultra pure): Polyethylene glycol mono [4-(1,1,3,3-tetramethylbutyl)phenyl]ether

Tissue Verification

Tissue Type
Head

Frequency (MHz)
2450

Liquid Temp.
()

Conductivity ()

Permittivity (r)

Targeted Conductivity
()

22.5 1.853 39.669

1.80

Targeted Permittivity
(r)
39.2

Deviation Conductivity
() (%)
2.94

Deviation Permittivity
(r) (%)
1.20

Date
May 20, 2022

Note: 1)The dielectric parameters of the tissue-equivalent liquid should be measured under similar ambient conditions and within 2 °C of the conditions expected during the SAR evaluation to satisfy protocol requirements. 2)KDB 865664 was ensured to be applied for probe calibration frequencies greater than or equal to 50MHz of the EUT frequencies. 3)The above measured tissue parameters were used in the DASY software to perform interpolation via the DASY software to determine actual dielectric parameters at the test frequencies. The SAR test plots may slightly differ from the table above since the DASY rounds to three significant digits.

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Report No.: BTL-FCC SAR-1-2112C154

4.2 SYSTEM CHECK

The system check is performed for verifying the accuracy of the complete measurement system and performance of the software. The system check is performed with tissue equivalent material according to IEEE P1528 (described above). The following table shows system check results for all frequency bands and tissue liquids used during the tests.

System Check
Head

Date May 20, 2022

Frequency (MHz)
2450

Targeted SAR 1g (W/kg)
52.10

Measured SAR 1g (W/kg)
13.50

normalized SAR 1g (W/kg)
54.00

Deviation 1g (%)
3.65

Dipole S/N
919

4.3 SYSTEM CHECK PROCEDURE
The system check is performed by using a system check dipole which is positioned parallel to the planar part of the SAM phantom at the reference point. The distance of the dipole to the SAM phantom is determined by a plexiglass spacer. The dipole is connected to the signal source consisting of signal generator and amplifier via a directional coupler, N-connector cable and adaption to SMA. It is fed with a power of 250mW (below 3GHz) or 100mW (3-6GHz). To adjust this power a power meter is used. The power sensor is connected to the cable before the system check to measure the power at this point and do adjustments at the signal generator. At the outputs of the directional coupler both return loss as well as forward power are controlled during the system check to make sure that emitted power at the dipole is kept constant. This can also be checked by the power drift measurement after the test.
System check results have to be equal or near the values determined during dipole calibration (target SAR in table above) with the relevant liquids and test system.

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Report No.: BTL-FCC SAR-1-2112C154
5. SAR MEASUREMENT VARIABILITY AND UNCERTAINTY 5.1 SAR MEASUREMENT VARIABILITY
Per KDB865664 D01 SAR measurement 100 MHz to 6 GHz v01r04, SAR measurement variability must be assessed for each frequency band, which is determined by the SAR probe calibration point and tissue-equivalent medium used for the device measurements. The additional measurements are repeated after the completion of all measurements requiring the same head or body tissue-equivalent medium in a frequency band. The test device should be returned to ambient conditions (normal room temperature) with the battery fully charged before it is re-mounted on the device holder for the repeated measurement(s) to minimize any unexpected variations in the repeated results. 1) Repeated measurement is not required when the original highest measured SAR is < 0.80 W/kg; steps 2) through 4) do not apply. 2) When the original highest measured SAR is  0.80 W/kg, repeat that measurement once. 3) Perform a second repeated measurement only if the ratio of largest to smallest SAR for the original and first repeated measurements is > 1.20 or when the original or repeated measurement is  1.45 W/kg (~ 10% from the 1-g SAR limit). 4) Perform a third repeated measurement only if the original, first or second repeated measurement is  1.5 W/kg and the ratio of largest to smallest SAR for the original, first and second repeated measurements is > 1.20. The same procedures should be adapted for measurements according to extremity and occupational exposure limits by applying a factor of 2.5 for extremity exposure and a factor of 5 for occupational exposure to the corresponding SAR thresholds. The detailed repeated measurement results are shown in Section 7.2.
Page 21 of 27

6. OPERATIONAL CONDITIONS DURING TEST 6.1 TEST POSITION
The location of the antenna inside EUT is as below.

Report No.: BTL-FCC SAR-1-2112C154

Note: The EUT restricts use and only test the corresponding ear.
Duty Cycle BT
85.38%

Page 22 of 27

7. TEST RESULT 7.1 CONDUCTED POWER RESULT 7.1.1 CONDUCTED POWER MEASUREMENTS

Report No.: BTL-FCC SAR-1-2112C154

Mode 2.4G SRD

Average Conducted Power(dBm)

Max.

CH1

CH37

CH76

Tune up 2403MHz 2439MHz 2478MHz

5.50

3.83

4.42

5.04

Note: 1) The Average conducted power of 2.4G SRD is measured with RMS detector. 2) The tested channel results are marks in bold.

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Report No.: BTL-FCC SAR-1-2112C154
7.2. SAR TEST RESULTS
General Notes: 1) Per KDB447498 D04, all measurement SAR results are scaled to the maximum tune-up tolerance limit to demonstrate compliant. 2) Per KDB447498 D04, testing of other required channels within the operating mode of a frequency band is not required when the reported 1-g or 10-g SAR for the mid-band or highest output power channel is:  0.8 W/kg or 2.0 W/kg, for 1-g or 10-g respectively, when the transmission band is  100 MHz. When the maximum output power variation across the required test channels is > ½ dB, instead of the middle channel, the highest output power channel must be used. 3) Per KDB865664 D01v01r04, for each frequency band, repeated SAR measurement is required only when the measured SAR is  0.8W/Kg; if the deviation among the repeated measurement is  20%, and the measured SAR < 1.45W/Kg, only one repeated measurement is required. 4) Per KDB648474 D04v01r03, SAR is evaluated without a headset connected to the device. When the standalone reported Body SAR is  1.2 W/kg, no additional SAR evaluations using a headset are required. 5) Per KDB865664 D02v01r02, SAR plot is only required for the highest measured SAR in each exposure configuration, wireless mode and frequency band combination; Plots are also required when the measured SAR is > 1.5 W/kg, or > 7.0 W/kg for occupational exposure. The published RF exposure KDB procedures may require additional plots; for example, to support SAR to peak location separation ratio test exclusion and/or volume scan post-processing.
WLAN Notes: 1. For exposure conditions with multiple test positions, such as handset operating next to the ear, devices with hotspot mode, procedures for initial test position can be applied. Using the transmission mode determined by the DSSS procedure or initial test configuration, area scans are measured for all positions in an exposure condition. The test position with the highest extrapolated (peak) SAR is used as the initial test position. When the reported SAR of the initial test position is  0.4 W/kg, further SAR measurement is not required for the other (remaining) test positions. Otherwise, SAR is evaluated at the subsequent highest peak SAR position until the reported SAR result is  0.8 W/kg or all test positions are measured. 2. Justification for test configurations for WLAN per KDB Publication 248227 for 2.4GHz WIFI single transmission chain operations, the highest measured maximum output power Channel for DSSS was selected for SAR measurement. SAR for OFDM modes (2.4GHz 802.11g/n) was not required due to the maximum allowed powers and the highest reported DSSS SAR. See Section7.1 for more information.

7.2.1 SAR MEASUREMENT RESULT

Test No.

Band

Channel

Test Position

Separation Distance
(mm)

Data Rate

Duty Cycle
(%)

Maximum Conducted Power SAR Tune-up Power Drift 1g (dBm) (dBm) (dB) (W/kg)

SAR 10g (W/kg)

Reported 1g SAR

W01 2.4G SRD 76

Left Earphone

0

3 85.38% 5.50

5.04

0 <0.001 <0.001 <0.001

W02 2.4G SRD 76

Right Earphone

0

3 85.38% 5.50

5.04

0 <0.001 <0.001 <0.001

W03 2.4G SRD 76 Rear Face_Left Earphone

0

3 85.38% 5.50

5.04

0 0.002 0.001 0.002

W04 2.4G SRD 76 Rear Face_Right Earphone 0

3 85.38% 5.50

5.04

0 <0.001 <0.001 <0.001

Note: The value with boldface is the maximum SAR Value of each test band.

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Report No.: BTL-FCC SAR-1-2112C154
8. SIMULTANEOUS TRANSMISSION CONDITIONS
The following tables list information which is relevant for the decision if a simultaneous transmit evaluation is necessary according to FCC KDB447498 D04 Interim General RF Exposure Guidance v01. The location of the antenna inside the EUT is shown as below picture:
Note: The EUT only has one antenna and does not have synchronous transmission function.
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1. TEST LAYOUT

APPENDIX

Report No.: BTL-FCC SAR-1-2112C154

Specific Absorption Rate Test Layout

Liquid depth in the flat Phantom (15cm depth) HSL_2300MHz-2700MHz_Head_17.4cm HSL_2300MHz-2700MHz_Body_19.5cm
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Report No.: BTL-FCC SAR-1-2112C154
Appendix A. SAR Plots of System Verification
(Pls See BTL-FCC SAR-1-2112C154_Appendix A.)
Appendix B. SAR Plots of SAR Measurement
(Pls See BTL-FCC SAR-1-2112C154_Appendix B.)
Appendix C. Calibration Certificate
(Pls See BTL-FCC SAR-1-2112C154_Appendix C.)
Appendix D. Photographs of the Test Set-Up
(Pls See BTL-FCC SAR-1-2112C154_Appendix D.)
End of Test Report Page 27 of 27



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