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established by the FCC. One of these limits is
expressed as a Specific Absorption Rate, or “SAR.”
SAR is a measure of the rate of absorption of RF
energy in the body. Tests for SAR are conducted
with the phone transmitting at its highest power level
in all tested frequency bands. Since 1996, the FCC
has required that the SAR of handheld wireless
phones not exceed 1.6 watts per kilogram, averaged
over one gram of tissue.
Although the SAR is determined at the highest
power level, the actual SAR value of a wireless
phone while operating can be less than the reported
SAR value. This is because the SAR value may
vary from call to call, depending on factors such as
proximity to a cell site, the proximity of the phone
to the body while in use, and the use of hands-free
devices. Before a phone model is available for sale
to the public, it must be tested and certified to the
FCC that it does not exceed the limit established
by the government-adopted requirement for safe
exposure. The tests are performed in positions and
locations (e.g., at the ear and worn on the body) as
required by the FCC for each model.
The highest SAR values are:
* Head: 0.42 W/kg
* Body (Body-worn/Hotspot): 1.15 W/kg
(body measurements differ among phone models,
depending upon available accessories and FCC
requirements).
While there may be differences between SAR levels
of various phones and at various positions, they all
meet the government requirement for safe exposure.
The FCC has granted an Equipment Authorization