This item is well made of for durable and practical use. Built-in 250mAh Li-polymer rechargeable battery, stop wasting your money to buy batteries again. This bike taillight can be charged from your computer or any device with a USB port. The that is highly elastic allows for easy installation and removal anywhere suitable. You can install it at front, back or somewhere else suitable for different purposes, you can also install it on as at night. Features - COB LED lights with high brightness, 5 light modes adjustable, easy to be noticed at night and in low-visibility environments. - IP63 waterproof level with -tight rubber USB port cover, ensures and reliable use in all conditions. - Built-in 250mAh Li-polymer rechargeable battery. This bike taillight can be charged from your computer or any device with a USB port. - With adjustable tape fastener, easy and quick to mount on your bike handlebars, seatposts, and even your . - Novelty shape design, make your bike look cool and stylish and add more individuality. Specifications - - Material: PC and Silicone - Size: About. 5.9 x 3.5 x 5.8 cm - Flashing : Flash/Slow flash/Alarm light/Strong Light/Weak Light - Lamp : COB - LED light Color: Red/Red and Blue - Recharge: USB - Battery: Build-in 250mAh Li-ion Battery - Charging time: 1. - : 10 Lumens - : IPX63 - Working Temperature: -20 degree centigrade~70 degree centigrade Package list: 1 x Rear Light 1 x Nylon Strap 1 x USB Cable