Convenient headlamp design provides hands-free versatility. High-output LED lights operate on a rechargeable battery or three AAA batteries (not included) providing a bright cast of light. Comfortable headband is fully adjustable for a custom fit. Its Advanced Focus System delivers your choice of a focused beam for long-distance or a spill beam for up-close activities. At maximum output of 155 lumens it runs for up to two hours. On the minimum setting of 2.7 lumens it runs for up to 50 hours. IPX4 water-resistant against splashing. Weight: 4.23 oz.