Telex/RTS BP-4000 Single-Channel Universal Beltpack (A4M Connector)

The BP4000 is a single-channel portable beltpack user station that works across RTS, Audiocom, and Clear-Com party-line systems, so one pack fits a mixed intercom shop. It powers directly off the party line and supports both dynamic and electret headset microphones, with an enhanced talk button and a remote kill function that lets the system silence a pack from the master station.

This A4M version carries a 4-pin male headset connector that mates with A4F headsets such as the PH-2, and a pair of 3-pin XLR jacks loop the line through so packs can be daisy-chained down a channel. It draws well under 60 mA and delivers over 140 mW to a 150 ohm headset in a rugged belt-clip case.