This exceptional rear light offers ten LEDs and a maximum output of 300 lumens; it is engineered for impressive efficiency and runtime, providing the best beam pattern for optimal light dispersion in even the most challenging conditions. Plus, with an impressive 80-hour max runtime, you can rest assured that this light will last as long as you need it to. Rigorously tested to IPX7 Waterproofing standards, it is built to withstand various weather conditions. With seven output modes, including highly disruptive Daytime Flash modes, wide-angle optics providing 270° visibility, USB-C waterproof charging(cable not included), and a lightweight yet durable co-molded design, it's the ultimate choice for every cyclist. A versatile mounting system attaches to aero or round seatposts and recharges via a waterproof USB-C connection.