[ MaxTo BT-57 Motorcycle Helmet Headset ]: BT-57 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[ Long Playing Time & 1500mAh Large Capacity Battery ]: Helmet Bluetooth headset electronics Built in 1500mA battery.Let you reduce the trouble of charging and have a pleasant trip.The headset supports 80 hours of continuous call and music playing time, and 80 hours of standby time. The charging time is 5 hours[ 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[ 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[ EASY To In Stall ]: Design with detachable velcro, easy to install it into the Helmet,fixed firmly. FCC certification. How to use? Step1:Take out the Helmet Headphone from the color box,stick the"Magic Tape"on both earphones. Step2:Tear off the tape paper of the earphones,and sitck it into the helmet ear position of both sides,before stick it,please align the position well. Step3:Stick the Helmet Headphones to the Velcro,Which is inside the helmet. Step4:Finish installation.