Nite Ize is an all-American company started through true entrepreneurial spirit in 1989 by a fisherman frustrated with his options for fishing at night with a flashlight so he sought to build a better mousetrap. Today they make a host of nifty remora-like accessories for flashlights, as well as other offerings, and are the embodiment of the American small business success story.
This is an upgrade for your AA MagLite, changing the front from the typical incandescent bulb to L.E.D. illumination and giving you a sporty on/off switch upon the rear of the unit. The on/off switch exchange allows you to turn the unit on and off without affecting the focus, and is waterproof and durable just like the originally-supplied rear of the MagLite. Lighting from L.E.D. illumination gives enormously longer bulb life, as well as squeezing more time out of each set of batteries which are easily installed.