This lighted LED reflective helmet marker was designed to be used on bicycle and motorcycle helmets, or on anything else you can imagine. The velcro material on the back of the marker allows the light to be attached to helmets, bicycles, backpacks, etc. Add visibility and safety while jogging, walking, bike riding, and more. With visibility of a mile, you can easily be seen. What's more, the marker acts as a reflector even when the LED light is off. * Flash or glow mode, visible over one mile * 100,000 hour L.E.D. life * 100 hour battery life (1 x CR2032 3V coin cell included and replaceable) * Reflective even when turned off * Rugged shock resistant design * Versatile Velcro attachment strip * 5.5 x 1.25 x .25 inches