Cell batteries are hidden in the sweatband, provide up to 72 hours of life and are easily replaceable. Material: 100% Brushed and Washed Cotton Twill. Baseball hat with 5 super bright LED bulbs. Widely used in night fishing, walking, cave exploration, riding, hunting etc. Long beam distance: 10 meters. Closure: 2 piece Velcro strap. Adjustable for any size head.