HKSUNKIN Open/Half Face Motorcycle Bike Helmet Earpiece Headset Mic Microphone For Kenwood Two Way Radio Walkie Talkie TK3118 TK3130 TK3131 TK3160 TYT BAOFENG 5R 2pin TK3170 TK3173 2pin Open/Half Face Motorcycle Bike Helmet Earpiece Headset Mic Microphone for Kenwood Wouxun Puxing Radio Security Door Supervisor 2pin Designed to work with moto/bike racing helmet. Noise cancelling with boom mic microphone. Dual speakers with sticker, can be pasted to inside of the helmet. PTT button with velcro which can be fixed to handlebar is convenient to use.