Digital DECT for superior clarity, security & range. ECO mode for longer battery life. Caller ID/Call waiting FSK/DTMF Tri-Lingual (English, Spanish & French). Silent mode turns off all ringers. Handset speakerphone. 100 Names/numbers phone-book. Voice mail message indicator light. Intercom and transfer calls between handsets. Expandable up to 12 handsets using 1 phone jack.