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distance between the phone and the user's head.
These RF exposures are limited by Federal
Communications Commission safety guidelines that
were developed with the advice of FDA and other
federal health and safety agencies.
When the phone is located at greater distances from
the user, the exposure to RF is drastically lower
because a person's RF exposure decreases rapidly
with increasing distance from the source. The so-
called "cordless phones," which have a base unit
connected to the telephone wiring in a house, typically
operate at far lower power levels, and thus produce
RF exposures well within the FCC's compliance limits.
Do wireless phones pose a health
hazard?
The available scientific evidence does not show that
any health problems are associated with using
wireless phones. There is no proof, however, that
wireless phones are absolutely safe. Wireless phones
emit low levels of radio frequency energy (RF) in the
microwave range while being used. They also emit
very low levels of RF when in the stand-by mode.
Whereas high levels of RF can produce health effects
(by heating tissue), exposure to low level RF that does
not produce heating effects causes no known adverse
health effects. Many studies of low level RF exposures
have not found any biological effects. Some studies
have suggested that some biological effects may
occur, but such findings have not been confirmed by
additional research. In some cases, other researchers
have had difficulty in reproducing those studies, or in
determining the reasons for inconsistent results.
What is FDA's role concerning the
safety of wireless phones?
Under the law, FDA does not review the safety of
radiation-emitting consumer products such as
wireless phones before they can be sold, as it does
with new drugs or medical devices. However, the
agency has authority to take action if wireless phones
are shown to emit radio frequency energy (RF) at a