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The exposure limit set by the FCC for
wireless mobile phones employs a unit of
measurement known as the Specific
Absorption Rate (SAR). The SAR is a
measure of the rate of absorption of RF
energy by the human body expressed in
units of watts per kilogram (W/kg). The
FCC requires wireless phones to comply
with a safety limit of 1.6 watts per
kilogram (1.6 W/kg). The FCC exposure
limit incorporates a substantial margin of
safety to give additional protection to the
public and to account for any variations in
measurements.
SAR tests are conducted using standard
operating positions accepted by the FCC
with the phone transmitting at its highest
certified power level in all tested frequency
bands. Although the SAR is determined at
the highest certified power level, the actual
SAR level of the phone while operating can
be well below the maximum value. This is
because the phone is designed to operate
at multiple power levels so as to use only
the power required to reach the network.
In general, the closer you are to a wireless
base station antenna, the lower the power
output.
Before a new model phone is available for
sale to the public, it must be tested and
certified to the FCC that it does not exceed
the exposure limit established by the FCC.
Tests for each model phone are performed
in positions and locations (e.g. at the ear
and worn on the body) as required by the
FCC.
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