RF Exposure
Lingji Innovations Technology Co., Ltd. LJ0001 BLES100 2BPK5-LJ0001 2BPK5LJ0001 lj0001
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Document DEVICE REPORTGetApplicationAttachment.html?id=8363441MRT Technology (Suzhou) Co., Ltd Phone: +86-512-66308358 Web: www.mrt-cert.com
Report No.:R25S1020055-U401
Report Version:
V01
Issue Date:
2025-06-04
RF Exposure Evaluation Declaration
FCC ID:
2BPK5-LJ0001
Applicant:
Lingji Innovations Technology Co., Ltd.
Product:
BLES100
Model No.:
BT-LE01-WR02-02
Serial/Family Model: BT-LE02-WR02-02
FCC Rule Part(s): FCC Part 2.1091
Result:
Complies
Evaluation Date: 2025-05-30
Reviewed By: Approved By:
Vincent Yu Robin Wu
The test results relate only to the samples tested. The test results shown in the test report are traceable to the national/international standards through the calibration of the equipment and evaluated measurement uncertainty herein. The test report shall not be reproduced except in full without the written approval of MRT Technology (Suzhou) Co., Ltd.
Template Version:0.1
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Report No. R25S1020055-U401
Version V01
Revision History
Description Initial Report
Report No.: R25S1020055-U401
Issue Date 2025-06-04
Note Valid
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Report No.: R25S1020055-U401
CONTENTS
Description
Page
1. General Information ............................................................................................................................... 4
1.1. Applicant........................................................................................................................................4
1.2. Manufacturer .................................................................................................................................4
1.3. Testing Facility...............................................................................................................................4
1.4. Product Information .......................................................................................................................5
1.5. Antenna Details .............................................................................................................................5
1.6. Device Classification .....................................................................................................................5
1.7. Applied Standards .........................................................................................................................5
2. RF Exposure Evaluation........................................................................................................................ 6
2.1. Limits .............................................................................................................................................6
2.2. MPE Exemptions...........................................................................................................................7
2.3. Calculated Result ....................................................................................................................... 10
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Report No.: R25S1020055-U401
1. General Information
1.1. Applicant Lingji Innovations Technology Co., Ltd. Room 106, A-1 Bldg. No.66. Xixiaokou Rd, Haidian Dist., Beijing, China
1.2. Manufacturer Lingji Innovations Technology Co., Ltd. Room 106, A-1 Bldg. No.66. Xixiaokou Rd, Haidian Dist., Beijing, China
1.3. Testing Facility
Test Site MRT Suzhou Laboratory
Laboratory Location (Suzhou - Wuzhong)
D8 Building, No.2 Tian'edang Rd., Wuzhong Economic Development Zone, Suzhou, China
Laboratory Location (Suzhou - SIP)
4b Building, Liando U Valley, No.200 Xingpu Rd., Shengpu Town, Suzhou Industrial Park, China
Laboratory Location (Suzhou - Wujiang)
Building 1, No.1 Xingdong Road, Wujiang, Suzhou, Jiangsu, People's Republic of China
Laboratory Accreditations
A2LA: 3628.01
CNAS: L10551
FCC: CN1166
ISED: CN0001
VCCI:
R-20025 R-20141
G-20034 G-20134
C-20020 C-20103
T-20020 T-20104
Test Site MRT Shenzhen Laboratory
Laboratory Location (Shenzhen)
1G, Building A, Junxiangda Building, Zhongshanyuan Road West, Nanshan District, Shenzhen, China
Laboratory Accreditations
A2LA: 3628.02
CNAS: L10551
FCC: CN1284
ISED: CN0105
Test Site MRT Taiwan Laboratory
Laboratory Location (Taiwan)
No. 38, Fuxing 2nd Rd., Guishan Dist., Taoyuan City 333, Taiwan (R.O.C.)
Laboratory Accreditations
TAF: 3261
FCC: 291082, TW3261
ISED: TW3261
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Report No.: R25S1020055-U401
1.4. Product Information
Product Name
BLES100
Model No.
BT-LE01-WR02-02
Serial/Family Model Note 2
BT-LE02-WR02-02
Bluetooth Specification
Bluetooth_LE 1M/2M
Antenna Specification
Refer to clause 1.5
Operating Temp.
-30~85 °C
Power Type
3.3VDC
Note 1: The information of EUT was provided by the manufacturer, and the accuracy of the information shall
be the responsibility of the manufacturer.
Note 2: The only difference between the two models is the antenna selection. Model BT-LE01-WR02-02
uses a PCB on board antenna, while model BT-LE02-WR02-02 uses an external PCB antenna. RF power
settings are exactly the same.
1.5. Antenna Details
Technology
Frequency Range (MHz)
Max Peak Gain (dBi)
PCB Antenna (On Board) PCB Antenna (External)
Bluetooth
2402 ~ 2480
4.59
4.25
Note: All antenna information (Antenna type and Peak Gain) is provided by the manufacturer.
1.6. Device Classification According to the user manual, this device is classified as a Mobile Device. So, the RF exposure evaluation requirements of § 2.1091 for mobile device exposure conditions subject to MPE limits.
1.7. Applied Standards According to the specifications of the manufacturer, the EUT must comply with the requirements of the following standards: FCC Part 2.1091 & KDB 447498 D04 Interim General RF Exposure Guidance v01
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Report No.: R25S1020055-U401
2. RF Exposure Evaluation
2.1. Limits According to FCC §1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) radiation as specified in §1.1307(b)
Limits For Maximum Permissible Exposure (MPE)
Frequency Range
Electric Field
Magnetic Field
Power Density
(MHz)
Strength (V/m)
Strength (A/m)
(mW/cm2)
(A) Limits for Occupational/ Control Exposures
0.3-3.0
614
1.63
*(100)
3.0-30
1842/f
4.89/f
*(900/f2)
30-300
61.4
0.163
1.0
300-1,500
--
--
f/300
1,500-100,000
--
--
5
(B) Limits for General Population/ Uncontrolled Exposures
0.3-1.34
614
1.63
*(100)
1.34-30
824/f
2.19/f
*(180/f2)
30-300
27.5
0.073
0.2
300-1,500
--
--
f/1500
1,500-100,000
--
--
1.0
f= frequency in MHz. * = Plane-wave equivalent power density.
Average Time (Minutes)
6 <6 <6 <6 <6
<30 <30 <30 <30 <30
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Report No.: R25S1020055-U401
2.2. MPE Exemptions For single RF sources (i.e., any single fixed RF source, mobile device, or portable device, as defined in paragraph §1.1307(b)(2) of this section): A single RF source is exempt if:
(Option A) The available maximum time-averaged power is no more than 1 mW, regardless of separation distance. This exemption may not be used in conjunction with other exemption criteria other than those in paragraph §1.1307(b)(3)(ii)(A) of this section. Medical implant devices may only use this exemption and that in paragraph §1.1307(b)(3)(ii)(A);
(Option B) Or the available maximum time-averaged power or effective radiated power (ERP), whichever is
greater, is less than or equal to the threshold P (mW) described in the following formula. This method shall
only be used at separation distances (cm) from 0.5 centimeters to 40 centimeters and at frequencies from 0.3
GHz to 6 GHz (inclusive). P is given by:
P th(mW) = {ERP20cm(d 20cm)x d 20cm P th(mW) = {ERP20cm 20cm < d 40cm
Where
x
=
-
log10
( 60 )
ERP20cmf
and f is in GHz;
and
ERP20cm(mW) = {2040f 0.3GHz f < 1.5GHz ERP20cm(mW) = {3060 1.5GHz f 6GHz
(Option C) Or using Table 1 and the minimum separation distance (R in meters) from the body of a nearby person for the frequency (f in MHz) at which the source operates, the ERP (watts) is no more than the calculated value prescribed for that frequency. For the exemption in Table 1 to apply, R must be at least /2, where is the free-space operating wavelength in meters. If the ERP of a single RF source is not easily obtained, then the available maximum time-averaged power may be used in lieu of ERP if the physical dimensions of the radiating structure(s) do not exceed the electrical length of /4 or if the antenna gain is less than that of a half-wave dipole (1.64 linear value).
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Report No.: R25S1020055-U401
Table 1 to §1.1307(b)(3)(i)(C) - Single RF Sources Subject to Routine Environmental Evaluation
RF Source Frequency (MHz)
Threshold ERP (watts)
0.3-1.34
1920R2
1.34-30
3450R2/f2
30-300
3.83R2
300-1,500
0.0128R2f
1,500-100,000
19.2R2
For multiple RF sources: Multiple RF sources are exempt if:
(A) The available maximum time-averaged power of each source is no more than 1 mW and there is a separation distance of two centimeters between any portion of a radiating structure operating and the nearest portion of any other radiating structure in the same device, except if the sum of multiple sources is less than 1 mW during the time-averaging period, in which case they may be treated as a single source (separation is not required). This exemption may not be used in conjunction with other exemption criteria other than those is paragraph §1.1307(b)(3)(i)(A) of this section. Medical implant devices may only use this exemption and that in paragraph §1.1307(b)(3)(i)(A).
(B) in the case of fixed RF sources operating in the same time-averaging period, or of multiple mobile or
portable RF sources within a device operating in the same time averaging period, if the sum of the fractional
contributions to the applicable thresholds is less than or equal to 1 as indicated in the following equation.
+
+
=1 ,
, =1
=1
1
Where: a = number of fixed, mobile, or portable RF sources claiming exemption using paragraph §1.1307(b)(3)(i)(B) of this section for Pth, including existing exempt transmitters and those being added. b = number of fixed, mobile, or portable RF sources claiming exemption using paragraph §1.1307(b)(3)(i)(C) of this section for Threshold ERP, including existing exempt transmitters and those being added. c = number of existing fixed, mobile, or portable RF sources with known evaluation for the specified minimum distance including existing evaluated transmitters. Pi = the available maximum time-averaged power or the ERP, whichever is greater, for fixed, mobile, or portable RF source i at a distance between 0.5 cm and 40 cm (inclusive). Pth,i = the exemption threshold power (Pth) according to paragraph §1.1307(b)(3)(i)(B) of this section for fixed, mobile, or portable RF source i. ERPj = the ERP of fixed, mobile, or portable RF source j.
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Report No.: R25S1020055-U401 ERPth,j = exemption threshold ERP for fixed, mobile, or portable RF source j, at a distance of at least /2 according to the applicable formula of paragraph §1.1307(b)(3)(i)(C) of this section. Evaluatedk = the maximum reported SAR or MPE of fixed, mobile, or portable RF source k either in the device or at the transmitter site from an existing evaluation at the location of exposure. Exposure Limitk = either the general population/uncontrolled maximum permissible exposure (MPE) or specific absorption rate (SAR) limit for each fixed, mobile, or portable RF source k, as applicable from §1.1310 of this chapter.
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2.3. Calculated Result Product Test Item
BLES100 RF Exposure Evaluation
Report No.: R25S1020055-U401
Test Mode Frequency Band
Tune-up
Antenna Gain Tune-up ERP Tune-up ERP
(MHz)
Conducted Power
(dBi)
(dBm)
(mW)
(dBm)
Bluetooth-LE 2402 ~ 2480
9.17
3.59
10.61
11.51
Note 1: Bluetooth-LE Tune-up power was from report No: R25S1020055-U201.
Note 2: Tune-up ERP (dBm) = Tune up Conducted Power (dBm) + Antenna Gain (dBi) - 2.15dB.
Note 3: Tune-up ERP (mW) = 10 Tune-up ERP (dBm) /10.
For single RF source, Option C Test Mode Frequency Band (MHz)
Bluetooth-LE 2402 ~ 2480 Note: R is from user manual.
/ 2 (m)
0.0020
R
Tune-up ERP
Thresholds ERP
(m)
(mW)
(mW)
0.20
11.51
768
CONCLUSION: The device qualifies for RF exposure test exemption at 20cm distance.
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Related FCC IDs:
- 2BPK5-LJ0001 - Lingji Innovations Technology Co., Ltd. BLES100 [-LJ0001] Microsoft Word 2021 Microsoft Word 2021