Clear-Com RS-603 Talkback Belt Pack and Headphones. The RS-603 is a 2-channel 3-pin dual-listen monaural beltpack with a 4-pin male headset connector and 3-pin female/male loop through intercom line connectors
It also has a 2.5mm AUX headset connector and an RS-232 data connector for programming. Two channels of audio are passed down a single 3-pin XLR with TWC-701 or TWC-704.
