Looks like all the computer manufacturers are reviving their childhood memories. They seem to be fascinating about the toys which they played in their childhood, the toys which work by winding them with a key. It is the mechanism to initiate a mechanical rotor in order to make it move with a certain speed. Logitech, which is renowned for its computer peripherals came with a innovative mouse which works based on this keying principle. This is a wireless mouse which works with no power. The name of this mouse isSustail.So this mouse works only on mechanical energy wirelessly. So just wind the Sustail to make it ready for work.