MULTIFUNCTIONAL: Our Helmet Light is exquisite about 6.3 cm length and very lightweight just 100g, USB charging mode, IPX5 waterproof degree, Ultra-bright, continuous working time lasting, install easily, carry outside convenient, use everyplace you needed.PROFESSIONAL PERFORMANCE: Super bright 400 lumens LED light, special wide floodlight angle, makes you more visible when you are cycling or having outdoor sports.DUAL FRONT & REAR BRIGHT LIGHT: Helmet light has different modes for your choice. One click is front light, two clicks are rear light, or use double-sided at the same time. Feel free to switch three lighting modes to steady on, slow flashing, fast flashing.FITS for MOST HELMET and BIKE: Suitable for most kind of the helmets and bike with using clips and straps. Helmet light comes with two sizes of rubber bands, feel free to install in handlebar diameter (20-32mm) or on the top of the helmet.NEVER WASTE YOUR MONEY: Bike Helmet Light are USB Rechargeable. It can charges from your computer or any device with a USB port, you dont need to replace batteries every week, never waste your money and time on batteries again.