?EASY To In Stall?Design with detachable velcro,Easy to install it into the Helmet,fixed firmly. CE and FCC certification.Appearance patent, Bluetooth Association certification.Important: please check whether the size of your helmet is appropriate before buying, and look at the size of our headphones. You can see the size of headphones in the picture introduction.If you have a problem with your helmet headset, please contact us at Buyer Center, and we will reply to you within 12 hours. ?Perfect Sound Quality?Motorcycle accessories By using windproof and more stable connection.Helmet Headphone DSP noise cancelling technology,Loud volume,this helmet headset transfers clear and high-quality stereo music sound.Compatible with all the smartphones with Can be used for Riding motorcycles, skiing, horseback riding,MP3,GPS are supportable independently. ?Waterproof Technology?No disturb Dustproof and IPX7 Waterproof by using Nano coating technology,Can protect the headset safely in Outdoors.No worry about the rain or snow even. ?Long Play Time? Built in 900mAh rechargeable Li-ion battery,Long stand-by and working time.Support 60 hours continuous talking and playing time, 500 hours standby time.Charging time 2 hours.Support display battery on phone. ?Effective Distance 20m?motorcycle helmet speakers One Helmet Bluetooth Headset wirelessly connected to two mobiles at the same time,Automatic connection and enjoy music,strong signal connection.Provide efficient and convenient communications in the riding.