Production Intercom BP1 1-Channel Station Belt Pack
BP1 belt packs are single-channel. The front panel controls are for the microphone, for controlling listening volume, and for signaling. The back panel has a 3-pin female XLR to connect to the system; a 3-pin male XLR for looping to the next station; a 4-pin male XLR for headset, and a switch to dynamic or electret.