Powerful and versatile LED taillight. Light and durable co-molded lens/body construction. Unique aero and round post compatible design. Five ultrahigh-output LEDs delivering up to 150 lumens. Mode Memory function returns to selected mode after turning off. Eleven unique modes including two high-visibility Daytime Flash modes. Enhanced lens with built-in side visibility. Integrated cable-free recharging USB stick.Features: Max lumens: 150 Lumens Weight: 61g Max Runtime: 30hours (on low setting) Since 2011, Lezyne has been developing LED lights and again have set new standards in design and function along the way. A team of in-house product designers and engineers create the highest quality lights in the industry. All Lezyne LEDs are tested in Lezyne's own integrating sphere; an instrument used to measure the lumen output. Lezyne also developed its own lenses to produce the best possible optics for bicycle lights.