Four-handset answering system with Caller ID/Call Waiting features DECT 6.0 digital technology for interference-free communications and Caller ID announce for easily screening calls. The handset and base announce the name of the caller so you don't have to scramble for the handset to see who's calling. Push-To-Talk features allow instant and easy communication between handsets. HD Audio takes sound quality to the next level. Choose from four preset audio profiles or use the equalizer to personalize bass, treble and natural tones for your individual hearing needs. Handset speakerphone allows hands-free conversations. Digital answering system digitally records up to 14 minutes of incoming messages, outgoing announcements and memos. Phone system includes four handsets and expands up to 12 handsets. Phone also features call-transfer using intercom, conference call, 50-name/number Caller ID history, ringer-volume control, English/Spanish/French setup menu, and 9-number speed dial.