One channel flush mount headset/speaker station The KB-112 is a versatile, high-quality remote speaker station that provides programmable push-to-talk two-way communications. It is almost identical to the KB-111A except that it is a single-channel, has a built-in electret mic, and operates in the half-duplex mode Ð similar to a walkie-talkie. Compatible with all Clear-Com intercoms, the KB-112 is ideal in applications where a headset is inconvenient (such as dressing rooms, front lobbies, etc).