Feature:1. [Applicable Place] The heavy duty noise cancelling headset is a headset specially designed for large noise places such as airports, racing cars, docks, and mining. It is durable and easy to use.2. [Applicable Groups] The hearing protection headphones are suitable for the staff who communicate with the aircraft in special places such as racing cars, docks, and high altitude operations.3. [Adjustable Cable and Boom] PU cable can be straightened up to 2.5m / 8.2ft in length for different heights, the sealed sponge earmuffs can be replaced, and the boom can be adjusted to suit different personnel.4. [With U94 PTT] PTT button is located at the bottom, and the red button is lightly touched to start a call. High strength PTT can be pressed continuously for 30,000 to 50,000 times. Push button to activate PTT.5. [PU Cable and With A Clip] The cable is made of cold resistant PU tensile wire with high flexibility and toughness. U94 PTT has a clip that can be hung on clothes or belts.How to Use:Plug and play.Specification:Item Type: Military Headset+U94PTTMaterial: PU+ABSColour: BlackCable Straighten Length: Approx. 2.5m / 8.2ftApplication: Suitable for GP88 GP-300 GP3688 DEP450 EP450, etc. MT HeadMicrophone Specifications:Sensitivity: -44±3dB at 1kHzRated Impedance: 680ΩProduct Frequency: 20Hz-160HzWorking Voltage: 1.5V-4.5VDirectional Function: Single Direction Noise CancellationSpeaker Specifications:Speaker Diameter: Approx. 36mm / 1.42inRated Input Power: 0.5WMaximum Output Power: 1WSensitivity: 100±3dBSpeaker Impedance: 8ΩWire SpecificationsAvailable Temperature: 30℃-60℃ / 86℉-140℉ Package List:1 x U94 PTT1 x Heavy Duty Noise Cancelling Headphone