The SM-201B intercom master is a multi-purpose intercom suitable for homes, offices or wherever communication to a single location plus convenient electrical door opening is needed. The solid state design combined with low voltage operation, permits easy and simple installation.

SM-201B master has a built-in voice amplifier, volume control, electronic tone signal, TALK, LISTEN and electric DOOR release (or other signaling device) buttons. Install the SM-201B on a standard 1 gang electrical box, or use our popular IH-400A cabinet for desk or surface mounting.