Features Light Warnings: With our LED Bike Tail Light, you can enjoy a high-brightness warnings light that alerts drivers behind you. The high brightness warnings isn't dazzlings, alerting, and cautioning vehicles. Waterproof Resistant: With waterproof design, our Rear Bike Light is resilient to heavy rain and splashes guaranteeing functionality even during inclement weather conditions. Quality Brightness: With COBs light technology, this Bike Back Light provides you with a clear and wide visibility, making you safer on the road. 4 Lighting Mode Options: The Tail Light features a one-touch switch with 4 different lighting modes depending on your preference including High brightness, Low brightness, Slow-Flashing, Fast Flashing. Get Riding Safety: The tail light emits an eye-catching wide-angle beam that can be seen from blocks away, need not worry about being knocked over by others Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Mode: 4 Modes Size: 7*2*2.2CM Weight: 29g Battery: 330 mAh polymers battery