One Touch Can Opener Opener – Can Opener – Instead of using a large electric can opener to avoid having to turn the knob, put this small (61/2′ x 21/2′) unit on top of the can & it automatically cuts it open from the side. You press the top button to start it & when the lid is cut off, it has no sharp edges. Use it on a small, medium or large can. Uses 2 AA batteries. – Rolyan products are internationally licensed & manufactured for home & clinical use. Most of their products offer a lifetime warranty.