abcGoodefg 3.5mm Plug Motocycle Helmet Earphone Stereo Earpiece Headset Earphone Headphone for with Mic & Volume Control for MP3 MP4 GPS Samsung iPhone HTC ect. Cell Phones Designed Specifically for Outdoor Biking and Cycling Conditions Hands-free calling for motorcycles and scooters. Back side with self-adhesive tape sticker and velcro band, you can easily install the flat headphones into your motorcycle helmet. There is a volume control on the earphone, can turn down/up the volume through earphone, more convenience. Work with MP3 player,cellphone, GPS, and other 3.5mm-plug music players.