This electric jar opener is as easy as setting it on the lid, pressing the button and watching it work. The vice locks on tight and unscrews it without any effort on your part. This hands-free jar opener does all the hard work for you. Robo Twist jar opener easily opens even the toughest jar lids. Locks on tight to the lid of any jar and unscrews it effortlessly. Easy to use - Place it on a jar lid and press the button. Vice clamps on tightly and removes the lid- adjustable for any jar size. Robo twist doesn't utilize blades or electricity. 2x AA batteries are required.