1. 2025 bike brake light ---- Streamline casing, unique CIRCLE+STRIP double-lighting design, lightweight 0.06lb, compact size 4.13x1.18x0.98inch, with output of 100 lumens, eye-catching aesthetic and excellent visibility. 2. More than a normal bicycle tail light ---- Besides USB C rechargeable & Ip65 waterproof, it features brake sensing, light sensing and motion sensing. For more information see photo #3 and #4. 3. 6 Modes rear bike light with memory function ---- Steady(6hrs), Strobe(5hrs), Flash(5hrs), Warning(8hrs),Breathing(10hrs), Meteor(10hrs). Single press the normal mode button to stwitch on and choose mode, long press to stwitch off. You can also turn on/off the light sensing function by pressing the control button.(white light indicator flashing means it's on) 4. Two Brackets for Saddle & Seatpost ---- Fit all Road, MTB, Hybrid and Commuting Bicycle, with quick release and stable design, no worries about falling off on bumpy roads or get stolen, you can easily take the bike back light off the mount. ATTENTION: Rotate until you hear a 'click' sound to secure the light to the mount. To remove it from the bracket, just reverse the rotation.