Powerful 90 Lumen bicycle tail light with cluster mounted array of LEDs work in unison for an extra wide and far reaching glow to maximize your visual presence both day and night 6 lighting modes for day and night use with run times are High Steady: 1: 30 hr, Group (low steady): 100 hr, Zoom: 6 hr, Steady Pulse: 6 hr, Low Flash: 30 hr, Daylighting High Flash: 3: 30 hr Steady Pulse shines a steady beam to help motorists gauge their distance while overlapping pulses keep them alert at night. Daylighting 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 sturdy flexible seat post mount, All while keeping a Compact form and weighing only 29 grams. Designed for convenience with USB rechargeable design and 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