[Notice:Thickness:0.55inch Dhickness:1.7inch] Before considering this product,please measure wether your helmet headset part can be installed. [ EASY To In Stall ]: Design with detachable velcro, easy to install it into the Helmet,fixed firmly. FCC certification. Appearance patent.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. [ Hi-Fi Stereo Sound Quality ]: Enjoy the best Hi-Fi stereo music,or GPS from the motorcycle Bluetooth headset with professional sound decoding chip, that have high quality sound effect and louder volume. Microphone that make calls clearer. [ Effective Distance 65Ft & Stable Connection ]: Automatic connection and enjoy music,strong signal connection.Provide efficient in the riding.You can use the Bluetooth helmet speakers when driving on the highway, without affecting listening to music and answering the phone. [ Long Playing Time & 900mAh Large Capacity Battery ]: Helmet Bluetooth headset electronics Built in 900mA battery.Let you reduce the trouble of charging and have a pleasant trip.The headset supports 48 hours of continuous call and music playing time, and 80 hours of standby time. The charging time is 5 hours. [ MaxTo BT-11 Motorcycle Helmet Headset ]: BT-11 adopts the latest 5.3 Bluetooth chip, using the latest 5.3 + EDR Bluetooth technology, super signal transmission low power consumption, spending all Bluetooth devices, support auto-answer function, no longer need to manually answer the phone when the call, safe and fast.