Aiphone DB-1MD Audio Master Station for DB Series, Hands-Free Audio Only Entry System

Aiphone Corporation DB-1MD DB series. The DB-1MD is an audio only master for the DB series hands-free two-wire door system. This system will support 1 door station with 1, 2 or 4 buttons and up to 5 inside stations per button. The DB-1MD master features a call tone volume control with mute indicator, receive volume control, all call button, talk button, and off button. It connects via 2 wires to the DA series door stations. Up to 4 sub stations can be added to this master and communication is possible between the 5 total stations via the all call button. ABS plastic construction.