Siemens CC75 User Manual page 51

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of CC75 MARS FCC_1COL us-en, (07.10.2005, 16:08)
U.S. FDA 51
these questions, no clear picture of the biological ef-
fects of this type of radiation has emerged to date.
Thus, the available science does not allow us to con-
clude that mobile phones are absolutely safe, or that
they are unsafe. However, the available scientific evi-
dence does not demonstrate adverse health effects as-
sociated with the use of mobile phones.
What kinds of phones are in question?
Questions have been raised about hand-held mobile
phones, the kind that have a built-in antenna that is po-
sitioned close to the user's head during normal tele-
phone conversation. These types of mobile phones are
of concern because of the short distance between the
phone's antenna – the primary source of the RF – and
the person's head. The exposure to RF from mobile
phones in which the antenna is located at greater dis-
tances from the user (on the outside of a car, for exam-
ple) is drastically lower than that from hand-held
phones, because a person's RF exposure decreases rap-
idly with distance from the source. The safety of so-
called "cordless phones," which have a base unit con-
nected to the telephone wiring in a house and which
operate at far lower power levels and frequencies, has
not been questioned.