Super Bright LED Head Lamp, 21-LED. Adjustable head lamp has 3 power settings & flash mode. Uses 3-AAA batteries to function (not included). Adjustable lycra bands stretch for comfort. LED head lamp light will provide years of use with 50,000 hours of rated life. Produces an impressive 42-lumens of light output to your immediate environment. Switch is weatherproof, use light even in wet conditions. Use the super bright head light lamp when doing a variety of activities including camping, hunting, working on vehicles, or anytime light is needed in a dark area.