Package Dimensions:30 x 24 x 17 cm 1. With USB Rechargeable Rear Light: Rear brain tail light for night riding are more reassuring. Embedded warning tail light at the rear, high brightness, capable of charging with USB, with 9 LED light modes. 2. Magnetic Goggles: Magnetic suction goggles filter strong light. Bike helmet for adults uses high definition PC goggles, the front view looks softer through the lens. 3. Integrated Molding: The bike helmet adopts an integrated molding process, which is more effective in dispersing impact compared to traditional bonding structures. 4. 18 Air Ducts Design: Adult bicycle helmet has18 air ducts, providing long lasting freshness, breathability, and reduce stuffiness. 5. Premium Material: The adult bicycle helmet is made of PC and EPS material, which is sturdy and durable, exquisite and beautiful. Specification: Item Type: Bike Helmet Material: PC, EPS Weight: Approx. 506g / 17.8oz Head Circumference: Approx. 58-65cm / 22.8-25.6in Battery: Built In Lithium Battery x 1 Capacity 220mAh PackageList: 1 x Helmet 1 x Goggles 1 x Accessory 1 x USB Cable 1 x Manual With USB Rechargeable Rear Light: Rear brain tail light for night riding are more reassuring. Embedded warning tail light at the rear, high brightness, capable of charging with USB, with 9 LED light modes. 18 Air Ducts Design: Adult bicycle helmet has18 air ducts, providing long lasting freshness, breathability, and reduce stuffiness. Integrated Molding: The bike helmet adopts an integrated molding process, which is more effective in dispersing impact compared to traditional bonding structures. Magnetic Goggles: Magnetic suction goggles filter strong light. Bike helmet for adults uses high definition PC goggles, the front view looks softer through the lens. Premium Material: The adult bicycle helmet is made of PC and EPS material, which is sturdy and durable, exquisite and beautiful. With USB Rechargeable Rear Light: Rear brain tail light for night riding are more reassuring. Embedded warning tail light at the rear, high brightness, capable of charging with USB, with 9 LED light modes. 18 Air Ducts Design: Adult bicycle helmet has18 air ducts, providing long lasting freshness, breathability, and reduce stuffiness. Integrated Molding: The bike helmet adopts an integrated molding process, which is more effective in dispersing impact compared to traditional bonding structures. Magnetic Goggles: Magnetic suction goggles filter strong light. Bike helmet for adults uses high definition PC goggles, the front view looks softer through the lens. Premium Material: The adult bicycle helmet is made of PC and EPS material, which is sturdy and durable, exquisite and beautiful.