Purchase Acousticom’s 6275-CA Helicopter Headset Noise Reduction: Passive NRR: 24 dB Impedance: High (Civilian)             Earphone: 933 (Dynamic) Microphone: 5720-CA Electret Earphone Impedance: 300 ohms Mic Impedance: 150 Ohms +/- %20 Earphone Sensitivity: 102dB min. @ 1mW rms input at 1kHz Mic...

U-174/U Features and Info: Unassembled Military Telephone Male Connector 4 Conductors MIL-C-9177 (M9177\2-1) This connector is commonly found on Military and Helicopter Headsets. Some headset models would include: H10-76, H10-26, H10-36, H10-56, H10-56HXL, H20-16, H10-13HXL, H10-13H, H10-60H Mates with NEXUS Series TJ-120, TJ-102, TJ-101...