Basecamp 4 Modes High Brightness LED USB Rechargeable Mountain Road Bicycle Rear Tail Light Back Lamp Waterproof Safety (Red-Black) [BE SEEN FROM BLOCKS AWAY, RIDE WITH CONFIDENCE] Super Bright X1 Bicycle tail Light. Simple to install, No tools required - Mount this rear bike light anywhere you want in seconds. [4 MODES] Long bright,Slow flash,Shun flash and Strobe. "Press&HOLD 1.5 seconds on the on/off when start to use, will directly into Long bright Mode. then single press will slow flash." press single on/off quickly into explosion lash, Final single press will flash in order, Press&HOLD 1.5 seconds on/off will close, just have standard/high/over drive lighting! TOTAL 4modes! [USB RECHARGEABLE BIKE LIGHT] Stop Wasting Your Money and Never Buy Batteries Again. USB rechargeable bicycle taillight and auto cut off when fully charged to protect battery. USB to Micro USB rechargeable Rear Bicycle Light - The bicycle rear light charges from your computer or any device with a USB port. High quality internal lithium battery, Only takes 2 hours to fully charge. [RUNNING TIME,SUPER BRIGHT,WATERPROOF] Long bright to be fully charged while be used for about 4 hours,Slow flash willl be used for about 12 hours,Shun flash will be used for about 12 hours,Strobe will be uses for about 8 hours. High brightness and energy saving LED,Super waterproof,make you riding freely regardless of rain. [A HIGH-QUALITY PRODUCT BACKED BY OUTSTANDING CUSTOMER SERVICE] If our product is any quality problem or Our mistakes.we will OFFER A REPLACEMENT and/or REFUND YOUR MONEY.