EFFORTLESS: Simply press the button to efficiently punch through the tall stack. Work smarter, not harder! DURABLE: High carbon steel punches for best performance and durability creating precise 9/32 inches (~7mm) holes with the push of a button. AC OR BATTERY OPERATED: Powered by a 120V AC adapter or 6 AA batteries(not included), providing reliable punching power wherever you are. JAM-FREE TECHNOLOGY: Auto-reverse if punch does not complete its cycle