Veyette Electronic Stapler and Electric Paper 2 Hole Punch for Office School Home, Adapter Included, Silver Stapler and hole puncher are combined into one, press the button to switch different functions, green for go, red means performing improperly A guide rail helps get a cleaning punching; Distance between holes is 70 mm and the hole diameter is 5.5 mm--the standards of North American use The stapler and puncher set staples 20 sheets and punches 14 sheets at a time respectively The auto stapler is powered by either 4 AA batteries (non-included) or AC adaptor (included), convenient to use The stapler can run on the included AC adaptor or 6 AA batteries (not included); plus, working on AC adaptor is more powerful than batteries