This hi-tech Logitech R400 wifi presentation laser pointer helps you scroll your pages up/down on any Microsoft office programmes wirelessly up to 15 meters from laptop/PC while still having full navigational control of your presentations and can laser point to screen at any corner. Works on windows,Mac,Linus. It takes two AAA batteries and consumes less Batteries and durable. USB is plug and play, no driver needed. Best gift for anyone you know does presentation. Despatch rider can deliver to buyer @ cost