The unit can operate on batteries only, but you must
use the AC power supply in order for the new call
indicator light and the display backlighting to work.
Install 4 AAA-size batteries to retain caller ID informa-
tion in the event of a power failure.
Disconnect the line cords from the back of the unit
and wait a few seconds for the unit to go into
1. Open the battery compartment door by pressing
on the door and sliding it in the direction of the
2. Insert 4 AAA-size batteries as shown on the
diagram in the battery compartment.
3. Replace the battery compartment door securely.