Fitbit Aria 2 Manuel Du Produit page 26

Rated maximum
output power of
transmitter
W
0.01
0.1
1
10
100
For transmitters rated a maximum output power not listed above, the recommended
separation distance d in metres (m) can be estimated using the equation applicable to
the frequency of the transmitter, where P is the maximum output power rating of the
transmitter in watts (W) according to the transmitter manufacturer.
Note 2 At 80 MHz and 800 MHz, the separation distance for the higher frequency range
applies.
Note 2 These guidelines may not apply in all situations. Electromagnetic propagation is
affected by absorption and reflection for structures, objects and people.
Separation distance according to frequency of transmitter
m
150 kHz to 80 MHz
d P
= 1.17* √
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
80 MHz to 800 MHz
d P
= 1.17* √
0.12
0.37
1.17
3.7
11.7
800 MHz to 2.5 GHz
d P
= 2.33* √
0.23
0.74
2.33
7.37
23.3
23