HKSUNKIN 3.5mm Plug Open Helmet Half Face Motorcycle Bike Helmet Headset Earpiece Microphone for iPhone 5S 6 6S Samsung Galaxy S5 S4 Motorola HTC Android Half Face Moto Motorcycle Bike Helmet Earpiece Headset Mic Microphone for 3.5mm smartphone 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.