Welcome to our store！</br> 1、Adjustable Design: This helmet has a 3 adjustable system, with up and down adjustment function, 360 degree adjustment knob, and adjustable side straps, which can adjust height and circumference to make the helmet suitable for different head sizes. Suggest a head circumference of 58 to 62cm/22.83 to 24.41in. 2、Durable Material: The helmet made of PC shell and EPS foam helps absorb and reduce the pressure caused by external impact, and secures the head during collision. Users wearing helmets will feel safer and more comfortable. 3、Tail Lights: The helmet has 3 lighting modes, stable, slow flashing, and fast flashing, allowing you to maintain lighting during nighttime cycling. It can warn cars and help passengers behind you clearly identify your direction, providing the highest possible visibility on the streets. 4、Strong Breathability: This product adopts a special aerodynamic design and 16 breathable vents, effectively reducing air resisting strength and sweat. 5、Ultra Lightweight: The helmet is lightweight and comes with a soft inner cushion, chin strap, and padding to ensure a more comfortable user experience. It can be charged via USB, bringing convenience to users' lives. <p class="wang-edit-text"><p class="wang-edit-text"> Item Type: Smart bike helmet Material: PC shell, EPS foam Weight: 404.00g/14.25oz Applicable Head Circumference: 58 to 62cm/22.83 to 24.41in Battery Type: Lithium battery (shipped with built in battery) Battery Capacity: 400mAh <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x Helmet 1 x Accessory 1 x Charging Wire Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>