Streamlight PolyTac LED 2CR123A Tactical Flashlight, Black: * Light Source: C4 LED technology, with a 50,000 hour lifetime * Lens: Glass lens, O-ring sealed * Battery: Two 3V "CR 123A" lithium batteries with a shelf life of 10 years * On/Off: Tailcap push-button provides 1-handed momentary or constant on operation * C4 LED technology (LED) * LED solid state power regulation provides maximum light output throughout battery life (LED) * IP X7 rated design; waterproof to 1 meter for 30 minutes