The Chef Craft Electric Jar Opener is 100% automatic Adapts to the size of the jar The Chef Craft Electric Jar Opener comes with an extra arm that provides more stabilty when compared to other electric jar openers Opening jars does not have to be a pain any longer. At Chef Craft we've got you covered. Simply push the power button and watch the magic happen. The Chef Craft Electric Jar Opener is battery operated (batteries not included) This product is great for seniors or those with arthritis Crafted with high-quality materials, the Chef Craft Jar Openers are built to withstand daily use