The electric C450E has all the convenience features you need to bind fast and easy. Exclusive "Paper Centering System" combined with vertical feed aligns paper for more accurate punching. "Paper Separator” divides your stack of sheets into the right thickness for punching. One-touch electric punching is easy and productive. Rotary dial for precise control of comb opening and closing. Punches letter size documents up to 25 sheets. Binds up to 425 sheets.