The HL® Series has gone hands-free! When your task requires both hands and a bright light with a wide, flood beam, reach for the ProTac HL Headlamp. It produces 540 lumens of light that reaches 172 meters. LIGHT SOURCE: C4® LED, with a 50, 000 hour lifetime. LENS: Glass lens; gasket sealed. BATTERY: Two 3 Volt “CR123A” lithium batteries, with a shelf life of ten years. ON/OFF: Multi-function, push-button switch. One handed operation of momentary, variable intensity or strobe mode. TEN-TAP® programmable switch allows user selection of one of three different programs: high/medium/low (factory default), high only, or low/medium/high. FEATURES: LED solid state power regulation provides maximum light output throughout battery life. IPX4 rated for water resistant operation. All openings o-ring sealed. 1 meter impact resistance tested. TEN-TAP® programmable switch allows user to select one of three different programs. Serialized for positive identification.