AT&T SynJ SB67138 DECT Cordless Phone - Silver - 4 x Phone Line - Speakerphone - Answering Machine - Backlight Part of the SynJ cordless business phone system this corded/cordless four-line phone system offers unsurpassed range that redefines long-range coverage and clarity. Extendable range allows up to 980 per repeater and up to two repeaters linked for 2940 of range. Expand the phone system up to 10 handsets. Push-to-Talk Intercom delivers instant and easy communication between handsets and between base and handset. Page intercom and call transfer between stations. Digital answering includes an auto attendant on each line individual voice-mail boxes 180-minute digital recorder and remote access. Phone system also offers Caller ID/Call Waiting DECT 6.0 Zero Blind Slot technology three-party conferencing music on hold 2.5mm headset jack handset speakerphone headset hold and mute functions selectable ringer melodies last 10-number redial and 50-name/number Caller ID history. System includes corded base one cordless handset charger two AC adapters battery pack and belt clip.