Audiovox GMRS-1525 Owner's Manual page 7

Charging the GMRS-1525:
Insert the charging transformer into a household electrical outlet and connect
the power jack to the socket located on the side of the GMRS-1525. The
red LED on the front of the charging transformer serves as a charge indicator.
Approximately 12–16 hours are required to fully charge the batteries.
Remember to turn your GMRS-1525 OFF before charging the batteries.
Caution: The charging transformer is intended for use with the
supplied rechargeable Ni-MH batteries. Do not attempt to
recharge any other type batteries. Avoid overcharging the
batteries to extend the batteries lifetime.
WITH COVER
OPEN
C
TRANSFORMER
CONNECTOR
7
CHARGING
TRANSFORMER
RED LED
CHARGING
INDICATOR