AT&T 915 - Manual (Page 5)

Installation
Table/desk installation
2
Installation Installation
1. Install batteries to provide power for the lighted dial
pad. Press the battery cover tab and remove the cover.
Install four new alkaline AA batteries (not included).
Be sure to follow the polarity guide in the battery
compartment. Replace the cover.
NOTE: The batteries are needed for the lighted dial pad
to work. Replace the batteries when the lighted dial pad is
dim or unlit in a dark room. Replace the batteries only with
four new alkaline AA batteries.