1. Small finger PTT, easy to infer 2. The earpiece/speaker can easily fit your ears to keep your conversations private. 3. The headset microphone is soft and can be placed on your mouth, making calls more convenient. 4. Lightweight neckband structure design, comfortable to wear and easy to use. 5. Very suitable for police, military, nightclubs, bars, paintball, security, restaurants, hotels, bodyguards, warehouses and noisy environments. 6. The sensitivity is -40 dB±3dB at 1000Hz (0dB = 1V / Pa) 7. Impedance: 2.2k ohm 8. Speaker diameter: 15mm 9. Rated power 100Mw 10. Weight: 70 grams 11. Suitable for RETEVIS H-777, R888s Plus, RT-5R, RT-B6, RT-5RV, RT1, RT2, RT5; suitable for POFUNG UV-A52, UV-82, UV-8, UV-6, UV -5R,888s,5RA; suitable for HYT TC286/386/2685/3865/6685/278/378/388/2100/2088; suitable for WOUXUN KG-UV8D, UV6D, UVD1PUV-899; suitable for PUXING PX-777, PX-888, PX-888K, PX-325, PX-358; suitable for Kenwood KPG KPG27D, KPG29D, KPG48D, KPG49, KPG55D, KPG56D, KPG62D, KPG66D, etc.