Audio Input Cable Features: - Use this 2.5mm mono plug with 3M™ Peltor™ HT Series listen-only headsets to connect to speaker microphones, VHF/UFH radios or personal entertainment devices; comes with 36-inch straight cable. - Connect headset to microphones, radios or personal entertainment devices - Convenient 2.5mm mono plug compatible with many common devices - Versatile 36-inch straight cable - Works with entire 3M™ Peltor™ HT Series listen-only headset line