AT&T Speakerphone with Caller ID with Call Waiting 959 - Manual (Page 6)

Battery Installation
Before using the telephone, you should install four AA batteries (purchased
separately). You can use the phone without the batteries to dial and receive
calls using the handset, but four AA batteries are required to power the
display screen, speakerphone and Caller ID features.
CAUTION: Always unplug the line cord before installing
new batteries.
1. Press down on the battery compartment tabs as shown
and pull to open the battery cover.
2. Insert four new AA batteries (purchased separately)
following the polarity markings in the battery
compartment.
3. Close the battery compartment cover, making sure
the cover snaps into place.
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