Full-featured and weatherproof, the LEDLENSER H5 Core Headlamp will meet your needs for hands-free illumination at work, at home, or in the great outdoors. The H5 Core emits 350 lumens in Boost mode, 200 lumens in Power mode, and 15 lumens on the Low Power setting. Runtime on a fresh set of two included AA alkaline batteries ranges from two to 20 hours, depending on the settings used. Its sturdy aluminum and polycarbonate construction has been tested to withstand drops from up to 4.9', and the lamp carries an IP67 water resistance rating. You can easily adjust the beam between a wide flood and a tight spot, and the lamp tilts steplessly 160° so you can place the light right where it's needed. The lamp can be detached from the washable elastic headband.