The Rockbros Q5 is a smart rear bicycle tail light designed to enhance your visibility and safety on the road. Built from CNC machined aluminum alloy, it features a high-intensity COB LED that offers several lighting modes, including constant, breathing, flashing, and SOS, to suit different riding conditions. A high-precision brake sensor automatically increases the light's brightness when you slow down, alerting drivers behind you more effectively. To simplify your ride, the device includes integrated light and motion sensors that automatically turn the light on when movement is detected in low-light environments and switch it to standby after about 30 seconds of inactivity. The IPX6 waterproof rating ensures it continues to function reliably during heavy rain. You can monitor the remaining power via blue LED battery indicators, and the 400mAh rechargeable battery provides up to 50 hours of use on a single USB charge. The versatile mounting system allows you to secure the light either to your seat post or directly under the saddle.