OPEN TIGHT, STUBBORN LIDS WITH THE TOUCH OF A BUTTON! ROBOTWIST™ eliminates all the straining, twisting and banging—just position the expandable jaw clamps onto lid, push the button and the jar opens ... hands-free! Works on jars and bottles with 1.2" to 3½" diameter lids. Compact enough to fit in a drawer. Uses 2 AA batteries (not incl.). 6½" L.