Use this 3.5mm mono plug with 3M(TM) Peltor(TM) HT Series listen-only headsets to connect to speaker microphones, VHF/UFH radios or personal entertainment devices; comes with 12-inch curly cable. Use this 3.5mm mono plug with 3M(TM) Peltor(TM) HT Series listen-only headsets to connect to speaker microphones, VHF/UFH radios or personal entertainment devices. Comes with 12-inch curly cable. (bul) Connect to speaker microphones, VHF/UFH radios or personal entertainment devices (bul) 3.5mm mono plug (bul) 12-inch curly cable (bul) Works with entire 3M(TM) Peltor(TM) HT Series listen-only headset line