Audiovox FR-560FM - Manual (Page 4)

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Your transceiver will achieve its maximum operating range when
communicating with other transceivers in a flat open area with
no trees or buildings obstructing its signal. Range may be up
to two miles under such conditions. Obstacles such as buildings,
trees or mountains will tend to reduce the transceiver’s effective
range.
PERFORMANCE
FCC WARNING
Replacement or substitution of transistors, diodes or other parts
of a unique nature, with parts other than those recommended
by the manufacturer, may cause a violation of the technical
regulations of Part 15 of FCC Rules.
SAFETY INFORMATION
Your wireless handheld portable transceiver contains a low
power transmitter. When the PTT button is pushed it sends out
radio frequency (RF) signals. The device is authorized to operate
at a duty factor not to exceed 50%. In August 1996, the Federal
Communications Commissions (FCC) adopted RF exposure
guidelines with safety levels for hand-held wireless devices.