1. Material: Polypropylene (PP) + Rubber 2. Dimensions: 142 * 20 * 35 mm 3. It is equipped with a 300mAh lithium battery, supports USB charging. The charging time is 1.5 - 2 hours, and the discharging time is 4 - 5 hours. It has a daily - grade waterproof function and uses a switch + remote control mode. 4. Accessories: Lights + Remote control + USB charging cable + Strap + User manual 5. Installation and usage: It is easy to install. This lightweight and durable bicycle helmet light can be attached to almost any type of helmet. It can also be used as backpack lighting, road lighting, etc. 6. USB charging and rechargeable function: The turn signals can be charged via USB. After charging for 1 to 2.5 hours, it can be used for 4 to 5 hours. The batteries of the remote control are easy to replace. 7. Waterproof function: The taillight is made of waterproof materials to ensure safe use even in rainy days. Hurry up and get one! 8. After - sales service: If you have any problems, please contact us. We will try our best to solve them within 24 hours. We promise to provide a refund service.