Check the listing for details. Aiphone Chime Com Door Answering System C-123LW. Condition: New. Listed at 249.99 USD. Aiphone Chime Com Door Answering Intercom C-123LW This dual master set includes a door station (C-D) and a 2 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 masters by pressing a call button that initiates a chime. Communication 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. Specifications: Power Source: 6V DC For EACH room station: Use (1) Aiphone SKK-620B (sold separately) OR 4 C batteries (sold separately) Current Consumption: 85mA max Communication: Press-to-talk at room station Communication output: 100mW Calling: 2-stroke chime Dimensions: Room Station: 7 ½ “ x 5 1/8 “ x 1 ¾ “ Door Station: 4 ¾ “ x 3 7/16” x 1 1/8” Features: Adds security and convenience to locked entrances Easty to install, can use existing doorbell wiring Melodic chime and caller talks hands-free Electric door release button Power supply or battery operated (both sold separately)