Features: 1) 80 channels frequency (1 to 80 channels) 2) One base with 11 handsets available 3) FSK / DTMF two types format caller ID 4) Big LCD screen 5) Base unit available for calling 6) Voice for caller ID and contact number broadcasting 7) 4 levels voice volume adjustable 8) 4 kinds of basic rings and 16 kinds of chord music rings selectable 9) Running clock displayed on the base unit 10) Alarm workable 11) Operator mode workable 12) Half-duplex intercom and call transferring between handsets 13) Call transferring between base and handset, handset and handset