Polycom VoiceStation 100 Conference Phone System VoiceStation 100 Ships With Telephone console unit, Power module, cord to console, telco cable to RJ-11, telephone jack and user guide. 360-degree, full-duplex performance for simultaneous 2-way communication 3 microphones and 1 speaker in the console; self-canceling echo Analog PBX or public switched telephone network interface Volume level adjustable up to 85 dB RCA output jack for recording or broadcasting