Kenwood KHS-21
Over-the-Head headset with swivel flexible boom mic single ear receiver, VOX-ready
Radio must have VOX feature. Compatible with TH-F7E, TH-K2, TH-F7, TH-K4, TK-2100, TK-3100, TK-260, TK-360, TK-272, TK-372, TK-3130, TK-3101, TK-373, TK-3131
Replaced by KHS-22