In the seemingly never ending battle to free USB ports, Logitech has given us a new transceiver (they call Unify) which allows up to 6 devices to connect wirelessly at once. For example, you could have a mouse, keyboard and another set of mouse and keyboard for one computer. Now when you buy a new mouse you can simply open the software and add your new keyboard or mouse to the existing transceiver instead of having one for the mouse and a separate one for the keyboard. The question is why have they not done this sooner? Logitech gives a list of compatible devices on their site which are available for pre-order.