The Night Runner Shoe Clip LED Light provides either a constant or flashing ultra bright LED light which is visible at up to a ½ mile. Ideal for runners, walkers and cyclists, it clips horizontally to the heel of shoes and will fit any size shoe with a heel width of 2 to 3.5 inches. Exercise more safely! This amazing light acts as a warning signal to others to keep them aware of your presence in the evening and dark nights.