User manual

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conditions under which people use wireless phones, so it is largely unknown what the
results of such studies mean for human health and safety. Three large epidemiology
studies have been published since December 2000. These studies investigated
possible associations between the use of wireless phones and primary brain cancer
(glioma, meningioma, acoustic neuroma, other brain tumors, and salivary gland
tumors), leukemia, or other types of cancer. None of the studies demonstrated the
existence of any harmful health effects from wireless phone RF exposures. However,
none of the studies can provide absolute findings about long- term exposures since
the average period of phone use in these studies was approximately three years.
4. What kinds of phones are the subjects of this update?
Here the term “wireless phone” refers to handheld wireless phones with built-in
antennas, often called “cell”, “mobile”, or “PCS” phones. These types of wireless
phones can expose the user to measurable Radio Frequency (RF) energy because of
the short distance between the phone and the user’s head. These RF exposures are
limited by FCC safety guidelines that were developed with the advice of the 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 reduced due to a person's
RF exposure rapidly decreasing 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, thus producing RF exposures far
below the FCC safety limits.