The KB-702GM remote speaker station permits the user to select between two channels of partyline communications, with the ability to talk and/or listen on the selected channel, like the KB-702 but adds a gooseneck mic connector and VOX circuitry.

The KB-702 remote speaker station permits the user to select between two channels of partyline communications, with the ability to talk and/or listen on the selected channel. The user can listen via the integral speaker, or may use a headset or telephone-style handset - and can talk via a headset mic, a telephone handset, or a push-to-talk microphone.  

The KB-701 remote speaker station connects to a single channel of partyline intercom, and operates in half-duplex mode, similar to a walkie-talkie. It features both an integral speaker and a flush-mount electret microphone with mic limiter and a push-to-talk button.