The ROCKBROS LT-RR100 is a compact bicycle tail light designed to keep you visible and safe on the road. It utilizes 20 small COB LED beads to provide clear illumination, offering three distinct lighting modes: a steady glow for constant visibility, a standard flash, and a specific LED cycling flash. To help you manage your battery, the light features vibration activation to wake up when you start moving and an auto-sleep function that triggers after 50 seconds of inactivity. Built from durable polycarbonate, this lightweight device weighs only 16g and carries an IPX7 waterproof rating, meaning it will continue to function reliably even during heavy rain. The internal 200mAh lithium battery supports up to 60 hours of use in flashing mode or 10 hours of continuous light, and it recharges via a convenient magnetic cable in about 2.5 hours. An intelligent brake sensing feature adds an extra layer of safety by alerting drivers behind you when you slow down. Installation is flexible thanks to the included mounting options, which consist of a clip bracket, a saddle rail bracket, a rubber band with a hook, and nylon cable ties. This variety allows you to secure the light firmly to different parts of your bike frame or seat, making it a practical choice for daily commuters and long-distance cyclists alike.