Aaron Lai

MPE Report

Hangzhou Tuya Information Technology Co.,Ltd VWRK4 Smart Audio Module with Wi-Fi and Bluetooth 2ANDL-VWRK4 2ANDLVWRK4 vwrk4

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Document DEVICE REPORTGetApplicationAttachment.html?id=4839479
Report No: 708882003254-00A
MPE Calculation

Applicant: Address: Product: FCC ID: Model No.: Reference RF report #

Hangzhou Tuya Information Technology Co.,Ltd Room701,Building3,More Center,No.87 GuDun Road,Hangzhou,Zhejiang China Smart Audio Module 2ANDL-VWRK4 VWRK4
708882003254-00; 708882003265-00; 708882003266-00

According to subpart 15.247(i)and subpart §1.1307(b)(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission's guidelines.

Limits for Maximum Permissible Exposure (MPE) (§1.1310, §2.1091)

(B) Limits for General Population/Uncontrolled Exposure

Frequency Range Electric Field

(MHz)

Strength (V/m)

Magnetic Field Strength (A/m)

Power Density (mW/cm2)

0.3­1.34

614

1.63

*(100)

1.34­30

824/f

2.19/f

*(180/f²)

30­300

27.5

0.073

0.2

300­1,500

/

/

f/1500

1,500­100,000 /

/

1.0

f = frequency in MHz; * = Plane-wave equivalent power density;

Averaging Time (minutes)
30 30 30 30 30

According to §1.1310 and §2.1091 RF exposure is calculated.

Calculated Formulary: Predication of MPE limit at a given distance S = PG/4R²= power density (in appropriate units, e.g. mW/cm2);
P = power input to the antenna (in appropriate units, e.g., mW); G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain factor, is normally numeric gain; R = distance to the center of radiation of the antenna (appropriate units, e.g., cm);

EMC_SHA_F_R_02.06E

TÜV SÜD Certification and Testing (China) Co., Ltd. Shanghai Branch 3-13, No.151, Heng Tong Road, Shanghai, 200070, P.R. China Phone: +86 21 61410123, Fax:+86 21 61408600

Page 1 of 3
Rev. 20.00

Report No: 708882003254-00A

Calculated Data: FPC antenna for Wi-Fi Maximum peak output power at antenna input terminal (dBm): Maximum peak output power at antenna input terminal (mW): Prediction distance (cm): Antenna Gain, typical (dBi): Maximum Antenna Gain (numeric): The worst case is power density at predication frequency at 20 cm (mW/cm2): MPE limit for general population exposure at prediction frequency (mW/cm2):
The max power density 0.088 (mW/cm2) < 1 (mW/cm2) Result: Compliant
Calculated Data: FPC antenna for BLE Maximum peak output power at antenna input terminal (dBm): Maximum peak output power at antenna input terminal (mW): Prediction distance (cm): Antenna Gain, typical (dBi): Maximum Antenna Gain (numeric): The worst case is power density at predication frequency at 20 cm (mW/cm2): MPE limit for general population exposure at prediction frequency (mW/cm2):
The max power density 0.0029 (mW/cm2) < 1 (mW/cm2) Result: Compliant

23.96 248.89 20 2.5 1.78 0.088 1.0
9.26 8.43 20 2.5 1.78 0.0029 1.0

EMC_SHA_F_R_02.06E

TÜV SÜD Certification and Testing (China) Co., Ltd. Shanghai Branch 3-13, No.151, Heng Tong Road, Shanghai, 200070, P.R. China Phone: +86 21 61410123, Fax:+86 21 61408600

Page 2 of 3
Rev. 20.00

Report No: 708882003254-00A

Calculated Data: FPC antenna for Classical Bluetooth
Maximum peak output power at antenna input terminal (dBm): Maximum peak output power at antenna input terminal (mW): Prediction distance (cm): Antenna Gain, typical (dBi): Maximum Antenna Gain (numeric): The worst case is power density at predication frequency at 20 cm (mW/cm2): MPE limit for general population exposure at prediction frequency (mW/cm2):
The max power density 0.0023 (mW/cm2) < 1 (mW/cm2) Result: Compliant

8.24 6.67 20 2.5 1.78 0.0023 1.0

- TÜV SÜD Certification and Testing (China) Co., Ltd. Shanghai Branch

Reviewed by:

Prepared by:

Tested by:

_____________________ Hui TONG
EMC Section Manager Date: 2020-07-16

_____________________ Jiaxi XU
EMC Project Engineer Date: 2020-07-16

______________________ Wenqiang LU
EMC Test Engineer Date: 2020-07-16

EMC_SHA_F_R_02.06E

TÜV SÜD Certification and Testing (China) Co., Ltd. Shanghai Branch 3-13, No.151, Heng Tong Road, Shanghai, 200070, P.R. China Phone: +86 21 61410123, Fax:+86 21 61408600

Page 3 of 3
Rev. 20.00



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