Automatic Jar OpenerPerfect for people suffering from arthritis or hand pain and injuries without hand strength. Efficient and energy saving, you only need two AA batteries to run the jar opener. Quickly and automatically open most jar sizes by pressing the top button. Make sure the outer arm of the can opener is firmly mounted on the can to prevent slippage, and the machine will stop working when the outer arm reaches the outermost or innermost side. Simple Operation: