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.