Fangrui Product Details 1. Retevis Eh050k 2 Pin Adjustable Volume Noise Reduction Aviation Headphone Microphone With Finger Ptt 2. Suitable For Places With High Background Noise, Such As Manufacturing Engineers, Processing Industry Technicians, Construction Teams, Airport Staff, Racing Teams, Etc. 3. Easy To Operate With Three Ptts 4. Finger Ptt Makes The Application Range Wider 5. Vox Switch Is Easy To Use 6. Double Volume Adjustment Knobs To Meet Different Needs 7. Dual Microphone Application Makes Voice Transmission Clearer 8. Abs Shell Material Is More Durable 9. Sponge-shaped Double Earpieces, More Comfortable To Wear 10. Comfortable And Soft Skin Earmuffs, Clear And Transparent Speakers 11. Waterproof Connector Design 12. Resist Compression Design 13. Impedance: 8+-1.2 Ohm 14. Rated Input Power: 50mw 15. Input Power: 80mw 16. Sensitivity: 121+-5db 17. Size (mm): Speaker 40mm+-0.2