❤ Friendly Tip: It is very dangerous to ride without a motorcycle helmet. It also violates traffic rules. In order to better meet your shopping needs, please measure your actual head circumference value before purchasing. Returning will waste your precious time.❤ DOT/ECE certified, lightweight, many advanced features, exciting fashion design elements for both men and women❤ Dual lens helmet with Bluetooth headset, easy to install, high-quality stereo that allows you to seamlessly switch between calls and music while driving.❤ Advanced ABS body with high pressure thermoplastic technology❤ Multi-density EPS buffer layer❤ There are multiple layers of security holes on the top and back that can be closed when not needed.Double lens flip helmet❤ Certificate: DOT certified❤ Material: ABS + high density EPS buffer layer❤ Battery Capacity: 180mAh❤ Standby time: about 50h❤ Listening to music: approx. 6h❤ Head Circumference Size:S: 55-56cmM: 57-58cmL: 59-60cmXL: 61-62cmA notice:❤ If you have any questions, please feel free to contact us. We are happy to offer you a 24-hour service. Your satisfaction is our greatest motivation.Package:1 * Dual Lens Flip Helmet1 * bluetooth headset