Getting started
Battery installation (purchased separately)
Before using the telephone, you should install four good AA alkaline batteries (not included) to provide memory backup and enable the use of some features. The four AA batteries are required for the following features to work: speakerphone, mute, flash, caller ID features, display, menu, directory, clock, audio assist and the IN USE light.
If you unplug the telephone from the telephone wall jack, or you lose telephone service for few minutes, and good batteries are not installed, the following information is lost: call history, numbers stored the directory, redial, and all settings in the feature menu. We recommend that you initially install new batteries and change the batteries soon after the low battery icon 
appears.
CAUTION: Always unplug the telephone line cord before installing new batteries.
1.Grasp and squeeze as the arrows indicate to open the hinged bracket.
2.Press the battery compartment tabs as shown below. Lift to open the battery compartment cover.
3.Follow the polarity guide markings in the battery compartment
to insert four new alkaline AA batteries (purchased separately).
4.Replace the battery compartment cover. Make sure the cover snaps into place.