Powerful and efficient single LED blasts 150 lumen flashes (90 in steady) Engineered to stand out in broad daylight and at night Built-in 24/7 Safety Technology provides 6 night and day modes Zoom mode signals those around you with gentle changes in brightness Enhanced cycling optics expands visability with an extra wide and long beam Freely adjust the brightness of Steady mode and flash tempo w/2 buttons Low battery indicator alert when a charge is needed Light mode memory saves the current mode before the light is turned off USB rechargeable internal battery lasts up to an impressive 210 hours Compact, water resistant design only weighs 59 grams Seat post and seat stay mounts included