Dimensions and Weight 2.4 ounces Aluminum Unextended length 6 3/4 inches Extended length - 22 1/4 inches 1.77 inch diameter head Battery Replacement Purchase quantity of 4 type LR44 batteries Twist off top of flashlight Pull off top and place to the side Dump old batteries out of the base Remove batteries from battery casing Put new batteries in casing Put the battery case back into the flashlight Screw top of flashlight on. Multiple ways to extend and bend Extendable with 360 degree flexible neck for illuminating hard to see places Can be flexed when fully extended or only partially extended Magnetic ends are a handy touch for picking up small dropped items. 3LED Excellent in closer viewing situations such as in car engines, behind computers that are in tight spaces, etc. The light source isn't extremely narrow which is what you would need for big open spaces