Audiovox GMRS-2000 Owner's Manual page 7

The battery charge indicator icon displays the battery charge level when the
AC adapter is unplugged. When the AC adapter is connected and in use,
the indicator icon will indicate a full charge as shown below.
Full Battery - three segments are illuminated.
Low Battery - one segment is illuminated.
Approximately 20-24 hours are required to fully charge the batteries. The
red LED charging indicator (15) will light whenever the batteries are
charging. A flashing red LED charging indicator denotes batteries are not
installed. You must set the CHARGE switch to the OFF position when
using any batteries other than the ones provided. Failure to do this may
cause damage to batteries resulting in personal injury and/or damage to
the unit.
Caution: The charging adapter is intended for use with the supplied
rechargeable batteries. Do not attempt to recharge any other type
of batteries.
CHARGE
ON/OFF
SWITCH
ADAPTER
PLUG
BASE
DC12V
UNIT
JACK
7
AC
ADAPTER