Streamlight ProTac LED CR123A Professional Tactical Flashlight, Black: * Light Source: C4 LED technology, with a 50,000 hour lifetime * LENS: Glass lens, O-ring sealed * Battery: One 3 Volt "CR 123A" lithium battery with a shelf life of 10 years * On/Off: Multi-function, push-button tactical tailswitch; one handed operation of momentary or variable intensity mode * LED solid state power regulation provides maximum light output throughout battery life * IP X7 rated design; waterproof to 1 meter for 30 minutes * Anti-roll facecap * Removable pocket clip * Serialized for positive identification