BLUETOOTH SPEAKERS - tune to audio as you ride yourself balancing hoverboard LED LIGHTING - Characteristics colour LED lights in the wheels and 2 LED headlights ELECTRICAL SAFETY CERTIFIED - Electric, battery, and charger programs tested & certified to UL 2272 security criteria. That I purchased two of them, one for all my children, ages 9 and 11. They totally love them! They play their songs via the Bluetooth speakers whenever they're riding them on, and we're thankful we have the ones using the self-balancing attribute. It makes it rather easy to get off and on. They picked up the procedure promptly, but did get some bumps and lumps in the learning procedure. They're quickly and turn fast!