Even if you don't use it for 10 years, its twin lithium batteries can instantly provide up to 6,500 candlepower for a full hour. It's 4.9" machined aluminum case with rubber armored sleeve, 0-ring moisture protection and unbreakable polycarbonate lens make it virtually indestructible. Triple action tail cap switch, spot-to-flood focus and spare xenon bulb are all standard. Notice we also include the 3 volt Lithium batteries- many sources do not!!