AiPhone DB-1SD is a hands free sub master station that has a tone volume control with mute indicator, receive volume control, All Call button, Talk button, and Off button can connects 4 wires to the DB-1MD master station.

Features:

• Used with the DA series door stations
• Up to 5 stations per door call button
• All Call between stations in same residence
• Internal communication can be hands-free (VOX) or push-to-talk (PTT)
• Door release powered by door station without the need of an additional transformer
• Call tone volume control with mute indicator
• Receive volume control
• Optional Call Extension Sounder

*NEW IN THE BOX
*One Year Warranty