ATT ATT-EL52315 ATT 3 HANDSET SYSTEM WITH ANSWERING3 Handset Answering System with Caller ID/Call WaitingSimulated fullduplex handset speakerphone22 minutes of digital recording time30 name and number caller ID historyExtra large displayTable and wall mountableBacklit display and keypadECO mode powerconserving technologyQuiet modeCall blockExpandable up to 5 handsets (accessory handset EL50005) DECT 6.0C all screeningCall interceptRemote accessMessage retrieval from handsetMessage time stampIntercom between handsetsConference between an outside line and up to 4 cordless handsets50 name and number phonebook directoryVolume controlVoicemail waiting indicatorLast 10 number redialMuteAny key answerBattery type: 2.4V 300mAh nickel metalhydride