Feature: 1. Widely Applicable: Heavy duty noise cancelling headphone, suitable for workers in airports, racing cars, docks, mining, high altitude operations, etc, who use walkie talkies for communication. 2. Easy To Use: PU coiled cord plug connection design, the straightened length can up to 2.5m/8.2ft, the sealed sponge earmuffs can be replaced, and the ear rods can be adjusted in different lengths. 3. Durable: High strength U94 PTT, which can be pressed continuously for 30,000 to 50,000 times, the wire is made of cold resistant PU tensile wire, which has high flexibility and strong toughness. 4. Portable: U94 PTT has a clip that can be hung on clothes or belts, the button activates the PTT (Push to Talk) device, making it safer and more convenient to communicate with others. 5. Compatible: The PTT button is located at the bottom of the earmuffs, and the red button is lightly touched to initiate the call, it is suitable for Hytera PD‑780 PD‑785 PD‑788 PD‑780G PD‑785G PD‑788G. Specification: Item Type: Radio Headphone + U94 PTT Material: PU + ABS Color: Black Application: Suitable for Hytera PD-780 PD-785 PD-788 PD-780G PD-785G PD-788G Microphone Specifications Sensitivity: -44±3dB at 1kHz Rated Impedance: 680Ω Product Frequency: 20Hz-160Hz Working Voltage: 1.5V-4.5V Directional Function: Single Direction, Noise Cancellation Speaker Specifications Speaker Size: Approx. Φ36mm/1.4in Rated Input Power: 0.5W Maximum Output Power: 1W Sensitivity: 100±3dB Speaker Impedance: 8Ω Wire Specifications Durable Temperature: 60℃-30℃. Package List: 1 x U94 PTT1 x Radio Headphone