Take your favorite cap and transform it into a hands-free light source - all you have to do is attach one of these waterproof, compact & lightweight clip lights to the brim. Choose from 3 or 5 super bright L.E.D. bulbs, available in white, red, green or blue bulbs, Contoured shape to fit cap brims securely, Top mount design does not obstruct line of vision & 2 CR-2032 Lithium batteries included.