For HYT TC-310 TC-1688 TC-320 ORICOM PMR 780 1280 Radio Acoustic Tube Headset
ORICOM: PMR 780, 1200, 1280, 2180. HYT: TC-310, 320, 1688. Dynamic Designs Surveillance Headset with Push-to-Talk Microphone. Shock & Water Resistant. For use with the following radios and many more that use a single 2.5 mm plug.