Push and punch action designed for easy use and handheld operation if desired. Optional battery power for portable convenience. Batteries supply enough power to last through more than a year of average use. Auto-unjamming feature and reversing mechanism. Features an adjustable paper guide to get the holes just right. Chip holder for easy disposal of waste. Operates on six AA batteries (sold separately) or AC adapter (included). Metal and plastic. Sheet Capacity: 10; Operating Method: Battery-Operated; Electric/Battery-Operated; Number of Holes: 3; Hole Diameter: 9/32 in.