Modern design Optima electric punch quickly punches 3 holes through as many as 20 sheets with the easy touch of a button. Efficient electronics combined with alignment indicators provide professional looking results. Automatic reverse clears paper jams for trouble-free punching. The portable punch operates with an AC adapter or 6 AA batteries. Optima20 Electric 3-hole punch. 20 sheet capacity. 9/32" punch hole diameter. Paper alignment indicators ensures accurate punching every time. Black/Silver. Automatic jam reverse ensures trouble-free punching with fewer disruptions. 6. 89x16. 732x5. 512 (IN). Swingline stands behind this high-quality punch with a Limited Lifetime 2 Year Warranty and a 100% Performance Guarantee. AC adapter or 6 AA batteries. Simple push-button start makes hole punching effortless. Efficient electric punch allows you to preserve your strength while still presenting professional results. Translucent chip tray minimizes mess and allows for easy cleanup of punched holes. Simply empty it when you notice its getting full. AC adapter or 6 AA batteries power this Swingline efficient punch.