One of a kind extremely bright 200 lumen tail light stands out day and night on busy streets. Patent pending adjustable flash speeds lets you maximize motorist awareness with its unique and easy to use 2 button control. This is the HARD MOUNT version. 6 lighting modes for day and night use (Steady: 2 hr to 210 hr, Zoom: 3 hr to 7: 30 hr, SteadyPulse: 4: 30 hr to 6 hr, Triple Flash: 29 hr to 75 hr, DayLightning Flash: 6: 30 hr to 37 hr, Random Flash: 5 hr to 30 hr). Wide range run time of 2 to 210 hours SteadyPulse shines a steady beam to help motorists gauge their distance while overlapping pulses keep them alert at night. DayLightning Flash bursts lightning-like flashes to make you stand out on busy roads in broad daylight Built to endure road cycling conditions with durable & water resistant body, and hard seat post & seat stay mounts, all while keeping a compact form & weighing only 75 grams. Designed for convenience with USB rechargeable design & low battery indicator Designed, engineered, and assembled in the USA. Founded in 1991, Cygolite is the proven bicycle light experts with exclusive designs and innovations crafted into quality products that are on the leading edge of safety