Aiphone C-123L/A ChimeCom Door Answering Intercom System Set, 2-Piece, Includes C-D Door Station, C-ML/A Master Station

C-123L/A: Single master set includes a door station (C-D) and a master stations (C-ML/A). Additional masters may be added. Each master requires a separate power supply, either the SKK-620 or 4 "C" batteries. The door station calls the master(s) by pressing a call button that initiates a chime. Communication is is Push to talk/release to listen at the master and hands free at the door station. Communication times out after being idle for twenty seconds.