Summary Batteries can be changed even while you are opening a can. So if the batteries go dead midway through cutting the lid, you can replace the batteries and let the can opener finish cutting the lid. Unit operates on its own once put on the can.
Summary This can opener opens cans easily, and leaves no strain on your wrist, edges are smooth after cutting. The cut is below the top lid which is why it cuts so smoothly leaving no jagged edges. Much safer against getting cut from the can lid after opening. Unit is powered by 2 AA batteries making it easily portable.