The ROCKBROS Q5 (TL907Q50) is a smart bicycle tail light designed to enhance rider visibility and safety. It utilizes a COB LED light source housed in a compact CNC aluminum alloy body, weighing only 55 g and measuring 40 x 34 x 34 mm. This durable construction is paired with an IPX6 waterproof rating, ensuring the light remains functional during heavy rain or splashes. Integrated sensors make the light highly responsive, featuring a motion sensor for automatic power management and an ambient light sensor to adjust to surroundings. A built-in brake sensor automatically increases brightness during deceleration to alert following traffic. You can choose from four lighting modes, including steady on and three different flash patterns, while four LED indicators keep you informed of the 400mAh battery level in 25% increments. Charging is handled via a modern USB Type-C port, providing a runtime of up to 50 hours. For installation, the package includes both an under-saddle rail mount and a silicone strap for seatpost mounting, making it a versatile choice for cyclists who want a lightweight, automated safety light that manages itself during a ride.