Compact and bright, the Voyager front light has three LEDs that shine through a light-optimizing optical lens. Features a quick-release bracket that mounts to standard or oversized handlebars in seconds without tools. 100-hour run time on four-AAA batteries, included. The Mars back light features four superbright LEDs that allow motorists to see you from a distance. Steady, flash and random modes let you choose the best setting for the conditions. Quickly mounts to your bike's seatpost or adapts to attach to a rack. Runs on two AAA batteries, included. Imported. VOYAGER Dimensions 2" x 1A1/2" x 3". Weight 7 oz. MARS Dimensions 1" x 1A1/2" x 2A1/2". Weight 4 oz.