Unique hands free sensor turns light on or off with ease on this Search and Rescue Multi-Function Headlamp. Constant current circuit for constant brightness. Maximum output of 180 lumens. Has a 35 meter beam distance and 20 hours of continuous runtime. Two white light Cree XP-LED bulbs for super brightness and one red LED to filter through darkness. Lamp fits comfortably around head with an adjustable band that wont pull hair or slip.