Features1Bicycle helmet is made from quality EPS foaming and NMLD shell, which is strong and durable. 2Adjustable headlights take care of your habits and can be adjusted up and down about 20 Degree and focus adjustment. 3EPS impact resistance improves the hardness of the helmet, and cushioning and antiimpact make the user safer during riding. 4The shape design is unique and beautiful, the hole design is reasonable, breathable and comfortable, and convenient to wear. 5With a head circumference adjuster, you can adjust it according to the size of your head, and the USB charger can be used for chargingSpecificationItem Type: Bicycle HelmetMaterial: EPS Foaming And NMLD ShellBuilt-In Battery: Polymer BatteryBattery Capacity: 1800mAh (Built-In Battery Shipped)Helmet Outer Diameter: Approx. 27 x 20cm / 10.6 x 7.8in (Manual Measurement Allows 1-2cm Error)Helmet Inner Diameter: Approx. 16 x 19cm / 6.2 x 7.4in (Manual Measurement Allows 1-2cm Error)Applicable Head Circumference: Approx. 57-62cm / 22.4-24.4inPackage List1 xBicycle Helmet1 x Charging Cable