According to §15

Benjamin

RF Exposure Info

Coros Wearables Inc. W521B 2AEHH-W521B 2AEHHW521B w521b

Coros Wearables Inc. W521B COROS APEX 2 Pro 2AEHH-W521B 2AEHHW521B w521b

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Shenzhen CTB Testing Co., Ltd.

FCC ID:2AEHH-W521B

Portable device

According to §15.247(e)(i) and §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.

According to KDB447498 D01 General RF Exposure Guidance V06

The 1-g SAR 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

·

The result is rounded to one decimal place for comparison

When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to

determine SAR test exclusion.

EDR:

Conduct

Max

Channel ed Conducte Tune-up tune-up

Modulation Freq. power d power power power

(GHz) (dBm) (mW) (dBm) (dBm)

Max tune-up power (mW)

Result SAR

Distance (mm)

calculatio

Exclusion

n

threshold

SAR test exclusion

2.402 6.94

4.94

6±1 7.00

5.01

GFSK 2.441 7.07

5.09

7±1 8.00

6.31

2.480 7.709 5.90

7±1 8.00

6.31

2.402 6.345 4.31

6±1 7.00

5.01

 /4DQPSK

2.441

7.114

5.15

7±1 8.00

6.31

2.480 6.727 4.71

6±1 7.00

5.01

2.402 6.829 4.82

6±1 7.00

5.01

8DQPSK 2.441 7.664 5.84

7±1 8.00

6.31

2.480 7.077 5.10

7±1 8.00

6.31

<5

1.55352

3.00

<5

1.97158

3.00

<5

1.98727

3.00

<5

1.55352

3.00

<5

1.97158

3.00

<5

1.57854

3.00

<5

1.55352

3.00

<5

1.97158

3.00

<5

1.98727

3.00

YES YES YES YES YES YES YES YES YES

BLE:

Conduct

Max

Channel ed Conducte Tune-up tune-up

Modulation Freq. power d power power power

(GHz) (dBm) (mW) (dBm) (dBm)

Max tune-up power (mW)

Result SAR

Distance (mm)

calculatio

Exclusion

n

threshold

SAR test exclusion

2.402 6.973 4.98

6±1 7.00

5.01

GFSK 2.44 7.09

5.12

7±1 8.00

6.31

2.480 5.981 3.96

5±1 6.00

3.98

<5

1.55352

3.00

<5

1.97117

3.00

<5

1.25388

3.00

YES YES YES

Shenzhen CTB Testing Co., Ltd.

2.4GWIFI:

Conduct

Max

Channel ed Conducte Tune-up tune-up

Modulation Freq. power d power power power

(GHz) (dBm) (mW) (dBm) (dBm)

Max tune-up power (mW)

Result SAR

Distance (mm)

calculatio

Exclusion

n

threshold

SAR test exclusion

2.412 7.579 5.73

7±1 8.00

6.31

802.11b 2.437 7.613 5.77

7±1 8.00

6.31

2.462 7.415 5.51

7±1 8.00

6.31

2.412 6.687 4.66

6±1 7.00

5.01

802.11g 2.437 6.521 4.49

6±1 7.00

5.01

2.462 6.511 4.48

6±1 7.00

5.01

2.412 6.801 4.79

6±1 7.00

5.01

802.11n( HT20)

2.437

6.749

4.73

6±1 7.00

5.01

2.462 6.704 4.68

6±1 7.00

5.01

<5

1.95983

3.00

<5

1.96996

3.00

<5

1.98004

3.00

<5

1.55675

3.00

<5

1.56480

3.00

<5

1.57280

3.00

<5

1.55675

3.00

<5

1.56480

3.00

<5

1.57280

3.00

YES YES YES YES YES YES YES YES YES

Conclusion: For the max result : 1.98727 FCC Limit 3.0 for 1g SAR.
Note: WIFI and Bluetooth do not support simultaneous transmission


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