Punches in a standard two-hole pattern (2 3/4" centers) quickly and quietly. Optional battery power for portable convenience. Includes reverse motor mechanism to clear jams. Adjustable paper guide for accurate punching. Automatic on/off. Chip holder. Operates on four AA batteries (sold separately) or AC adapter (included). Sheet Capacity: 12; Operating Method: Electric; Number of Holes: 2; Hole Diameter: 1/4 in.