SAFETY WARNING TAIL LIGHT-As a bicycle safety warning light, 20lumens output is enough, it is bright, compact, easy to carry, and most importantly, not expensive, very worth buyingUSB RECHARGEABLE AND SAVE YOUR MONEY ‚ Never Waste Your Money on Batteries again. Save the Hassle to Replace Batteries Every Week. They charge from your computer or any device with a USB port. Takes 2-3 hours to fully charge and has a Runtime of 4-10 hours on the highest settingEASY TO INSTALL AND REMOVE – Leave your screwdrivers in the toolbox, and detaches in under 2 seconds with NO tools required. Can be mounted almost anywhere. WATERPROOF AND SHOCK RESISTANT: IPX4 Waterproof gradeSuitable for the professional or casual bicycle rider. Brand: Vlra Color: White Bike Brake Type: Unavailable Frame Material Type: Mixed null: 50g. Bicycle Type: Bikes Accessories. Wheel Size: Unavailable. Number of Wheels: Unavailable. Number of Speeds: Unavailable. Color Family: Multicolor. Are batteries needed to power the product or is this product a battery: No. Is this a Dangerous Good or a Hazardous Material, Substance or Waste that is regulated for transportation, storage, and/or disposal: No.