Master Vision Cat's Eyes Cap Light. Hands free and lightweight. The most practical hands free and lightweight compact light source available. Great for hunting, tracking, hobbies, mechanical work, camping and much more! Engineered to withstand extreme conditions and rugged use. Powered by 2 lithium coin batteries for approximately 24 hours of ultra bright white light from 5 LED bulbs with 10,000 hours of burn time each. Attached to cap. 1.2 oz. with batteries.