Máy chủ Intercom AIPHONE DB-1MD –       The DB-1MD hands-free 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 station. 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. –       Điện […]