Description 100% Brand New, High Quality Material: Abs Dimensions: 8.7x3.5x1.5 cm Weight: about 45g Charging voltage: 3.7v Working voltage: 2.6-4.2v Working current: 30ma Waterproof grade: IP67 Built-in lithium battery capacity: 200MAH (10 beads capacity 350mah) Features: 1. Universal warning safety light can be placed on helmets, motorcycles, electric bicycles, bicycles, backpacks, etc. 2. The lightweight taillights feature an ABS housing that provides an IPX6 waterproof rating to deal with most rainy weather conditions. 3. Provide 3 lighting modes, press the button to switch once to switch between left/right/flash modes. 4. Rechargeable tail light with built-in lithium ion battery that provides 8 hours of lighting after 2 hours of charging via USB 5. Easy installation by hook and loop patch. Secure one side of the helmet with adhesive (included) and attach the tail light to it. You can always remove the tail light and reconnect it. Notes: 1. As we all know, different computers display different colors, and the actual color may be slightly different from the picture below. 2. If you find it difficult to choose the size, you can contact me at any time, we will give you some suggestions, but only for your reference. Package Included: 1pcs bicycle helmet tail light (including battery) Thank you for your support!Welcome to buy from us!There are so many useful and cheap item in our store. Have a nice day!