Nite Ize Brim Lit, LED Hat Light, Flexible & Lightweight, Hands Free Light That Clips Easily & Securely On Nearly Any Hat, Cap, Or Visor Brim, High Density Eva Foam, Slides Underneath Your Hat's Brim & Easily Accommodates Its Shape, 2 Spring Tension Clips Automatically Adjust To The Brim's Thickness, Quick Press Of The Button Activates The 4 LED's, High Mode For More Directed Light Or Low Mode For Glow, Perfect For Illuminating Outdoor Nighttime/Early Morning Tasks Around The Campsite, Garage, Hunting Or Fishing While Keeping Your Hands Free, As Well As Hard To Reach Jobs Under Cabinets & In A Tight Crawl Space, Powered By 2 Replaceable Lithium Batteries Included.