AT&T CL2940 Corded Phone with Caller ID/Call waiting, Speakerphone, XL Tilt Display, XL Buttons & Audio Assist Volume Boost Caller ID/Call Waiting Speakerphone, Audio Assist Extra-Large Tilt Display, LCD Display, Hearing aid compatible Extra-Large Buttons, Extra-Loud Ringer. Table- and wall-mountable DSL Subscribers may need to use a DSL Filter. Line power speakerphone The telephone works without AC Power. For the Caller ID to function, four AA batteries (not included) are necessary