Robo Twist Ja 1014 &ndash; The Hands Free Easy Seen on TV Opener &ndash; Works on All Jars, Small, White Robo twist adjusts to fit any jar sizes and guarantees a firm grip around lids Easy to use: position it on the lid, press the easy-switch button, and watch it rotate and uncap. Its so easy even kids can use it Energy efficient: Rob twist uses very little energy (uses 2 pcs AA Batteries) Compact: compact and versatility in 1 user friendly kitchen device Size: 7.2 inches long; weighs 0.80 lbs