V40038BT True Wireless Earphones RF Exposure Info RF Exposure SHENZHEN SHENGLAI TECHNOLOGY CO.,LIMITED

SHENZHEN SHENGLAI TECHNOLOGY CO.,LIMITED True Wireless Earphones

FCC ID Filing: 2AL9B-V40038BT
Purchase on Amazon: True Wireless Earphones

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Page 1 of V40038BT True Wireless Earphones RF Exposure Info RF Exposure SHENZHEN SHENGLAI TECHNOLOGY CO.,LIMITED

RF Exposure evaluation
Product Description: True Wireless Earphones
Model Number: V40038BT
FCC ID: 2AL9B-V40038BT
According to 447498 D01 General RF Exposure Guidance v05 The 1-g and 10-g SAR test
exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are
determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test
separation distance, mm)] ·[√f(GHz)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR,
where
f(GHz) is the RF channel transmit frequency in GHz
Power and distance are rounded to the nearest mW and mm before calculation
According to the follow transmitter output power(Pt)formula:
Pt=(E x d)2/(30 x gt)
Pt=transmitter output power in watts
gt=numeric gain of the transmitting antenna (unitess)
E=electric field strength in V/m
d=measurement distance in meters (m)
According to the formula described above:
Emax=97.68dBuv/m=0.077V/m, d=3m, gt=1
Pt=(E x d)2/(30 x gt)=(0.077x3)2 / (30x1)=0.001779W=1.78mW
The result is rounded to one decimal place for comparison
Worse case is as below: [2402MHz -1.78mW output power]
(1.78mW / 5mm)*[√2.402(GHz)] = 0.55 < 3.0 for 1 - g SAR
Then SAR evaluation is not required
NOTE: For the maximum power, you can refer FCC test report.
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Document ID3853115
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Document DescriptionRF Exposure
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeRF Exposure Info
Display FormatAdobe Acrobat PDF - pdf
Filesize64.94kB (811692 bits)
Date Submitted2018-05-16 00:00:00
Date Available2018-05-16 00:00:00
Creation Date2018-04-28 11:56:37
Producing SoftwareMicrosoft® Office Word 2007
Document Lastmod2018-05-15 11:17:53
Document TitleRF Exposure
Document CreatorMicrosoft® Office Word 2007
Document Author: USER

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