Features: This tail light features a brake sensing function that automatically increases brightness when you apply the brakes, alerting vehicles behind you to your presences. Staying safe while cycling with this Brake Sensing Tail Light. Its high intensity LED designs ensures powerful illumination, increasing visibility for a safety riding. Designed for all cycling enthusiasts, whether for daily commutes or long distances rides, this tail light offer dependable lighting and warning functions. With its waterproof designs, it works perfectly in almost weather conditions, and providing reliable performances. It is a must have accessory for night cyclists. Perfect for road cycling, this light provides high intensity illumination, ensuring your safety for riding. Its easy installation allows you to mount it on back bike. Specifications: Material: Plastic Color: As The Picture Shows Package Weight: approx.80g Size: approx.53mm/2.09in (More Size Detail, Please See Photo.) Package Includes: 1Pc Bike Tail Light note: Please allow 1-3mm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!