Powered by 4 easily available AA batteries, this is an excellent, 8" long very versatile utility Hi-Tech flashlight. It's simple focus change is accomplished by sliding the head 3/4" in or out - flood to spot, and back again. And although it is not designed as a super-spot, it does have a substantial maximum beam throw of 885 ft. The high lumen output is 350, with a lower setting of 50 lumens. A sturdy nylon belt carrier makes it easy to keep at-the-ready when moving around.