Open Up Power Twist Jar & Bottle Opener Opens metal or plastic twist-off and screw-off lids, even those difficult depress-and-twist prescription bottle tops Opens any size top-from 1/2" diameter nail polish caps to large 4" vacuum-sealed lids Easily mounts under cabinet or shelf for simple, safe operation--parts and instructions included Cordless electric motor operates on 4 "D" batteries (not included) Safety pressure switch activates the motor as you hold the jar or bottle up within the cone; loosens the top with 3 to 5 times the power of your hand