The OEM Swingline Portable Electric Hole Punch SWI74515 offers effortless, automatic three-hole punching with a single touch of a button. It can punch 9/32" holes through 15 sheets of 20 lb. paper at a time. The reset button is designed to clear jams, and the hinged clip door allows for easy emptying. This electric punch operates on the included AC adapter or six AA batteries (sold separately), with a battery life lasting up to 3,000 punches.