Prepare for a groundbreaking sound experience with the Boom ±?? Audio N02 Full-Face Helmet. This state of the art full-face motorcycle helmet is ready at mile one with no setup neede ‚no fussing with wires or positioning speakers. Enjoy tunes on the built-in FM radio and intercom with up to eight riders. And with integrated Bluetooth technology you can pair your Bluetooth -enabled mobile device for navigation, favorite play lists, and hands-free calls. Average Weight: 3 lbs. 12 oz. or 1,680 grams. Helmet Construction: Fiberglass composite shell. Double D-ring chin strap. Stay Cool: Chin and forehead venting. Interior & Linings: Removable, washable liner. Built-in Sena 20S Bluetooth communication system links up to eight riders for intercom, integrated speakers and microphon ‚no setup or install needed. Larger speakers for more bass and improved sound quality. Built-in FM radio. Includes rechargeable battery and charger. Optional ear pads and ear cuffs sold separately. Other Features: Bluetooth 4.1, Headset Profile (HSP). Hands-Free Profile (HFP). Advanced Audio Distribution Profile (A2DP). Audio Video Remote Control Profile (AVRCP). Advanced Noise Control. Wind noise reduction. Working distance of up to 900 meters (0.5 miles) in open terrain. Supports up to 4 riders. Built-in FM radio with RDS AF (Radio Data System Alternate Frequencies). RF certified in the US, Canada, Mexico, EU28, and Australia only. Ride Enhancing Features: Reflective material and piping. Helmet bag included. Manufacturer & Certification: Sena. Meets ECE & DOT safety standard FMVSS 218.