These things are great! What it is - you plug your computer into the main slot on the socket, and plug your peripherals (printers, scanners etc.) into the other available sockets. Whenever you switch off your PC, the plug then automatically switches off those peripherals. The review states it can save you up to £100 per year in electricity charges for a typical home setup. ALSO it is a surge protector, protecting your valuable equipment from power surges. This is the lowest price around, and you get a few pence Quidco off too!