LED Lenser P17 LED Flashlight 880050 is a full-sized, no holds barred lighting machine that makes no compromises to bring you the brightest, longest lasting light around. These LED Lenser flashlights were designed to meet the needs of law enforcement personnel, firefighters, and EMT first responders who often rely on their flashlights to save lives. Clocking in at a weighty 28.18 ounces and over a foot long, these flashlights mean business, and police officers will note that the P17's hard metal heft works quite well as a self-defense weapon. The LED Lenser P-17 Law Enforcement Flash Light attains amazing battery power with its three D-cell batteries; the P17 is capable of producing 180 lumens of light for 55 hours on Power mode, or 40 lumens for a ridiculous 338 hours on Low Power mode. LED Lenser has equipped this professional flash-light with the Dynamic Switch system for choosing lighting modes. A click of the power switch toggles between Power, Low Power, and Off modes, and the flashlight will enter the high-powered Boost mode if you hold down the power button. What's more, the flash light's Rapid Focus system lets you expand or contract the beam shape using nothing more than your thumb. With IPX4 waterproofing, an extremely long battery life, and quick switching between three lighting modes, the LED Lenser P 17 Dynamic Switch Light deserves to be your constant companion whenever you're on duty.