1. The earpiece is designed to fit your ear canal, so you can transmit your voice through voice vibration 2. It is made of soft silicone rubber, so you will not feel discomfort even if you wear it for a long time 3. Since the speaker/microphone is hidden in your ear canal, it is not sensitive to any background noise. It is ideal for use in high environments (such as driving, riding motorcycles and bicycles) 4. The plastic clip allows you to fix the microphone/speaker to your clothes 5. Wire: PU 6. Weight: 37g 7. Approximate length: 156mm 8. Suitable for RETEVIS H-777/RT-5R/RT-B6/RT-5RV/RT1/RT2/RT3/RT5/RT7/RT8/RT81/RT21; suitable for POFUNG UV-A52, UV-82, UV- 8,UV-6,UV-5R,888s,5RA; suitable for BAOFENG UV5R, UV8, UV8D, UVB5, UVB6, A52; suitable for Kenwood KPG KPG27D, KPG29D, KPG48D, KPG49, KPG55D, KPG56D, etc.