Rigel Systems Military Infralite Switchable 2-Green/2-Infrared LED Flashlight with Batteries The Finest LED Flashlights for Astronomy, NightVision, and Cameras DUAL Ultra-bright LEDs... The best and the brightest with lifetimes of 100,000+ hours, never break, and provide smooth illumination. Thumbwheel Brightness Control...Dial up just the right amount of light and extend battery life. Energy Efficient... Up to 320+ hours at the dimmest setting, 12+ hours at the brightest, from one 9V Alkaline. Exclusive brightness regulation circuitry... keeps the LEDs shining bright as batteries age, unlike other LED flashlights which start bright but quickly fade.