Lightweight, compact and engineered to withstand extreme conditions and use, the Cat's Eyes Cap Light is powered by 4 lithium coin cell batteries for approximately 24 hours of ultra bright white light from 3 LED bulbs with 10,000+ hours of burn time each. Lightweight, only 1.24 ounces with batteries. Water resistant. Attaches to cap for the most practical, hands-free light source available. Available in three light colors: White - Original - A great multi-purpose light for around the home, in the garage or outdoors. (24-hour battery life) Green - Hunter - Allows you to distinguish colors on a map or chart, and provide light that will not upset most animals. (20-hour battery life). Ideal for hunting/tracking, night fishing,etc. - an ideal tool for the professional or recreational outdoorsman. Red - Stealth - Can't be seen as readily as a white light, but still gives off an excellent source of light. (20-hour battery life). Excellent for reading maps or charts in the dark. Does not cause your eyes to have to readjust.