A new type of mouse is being developed which would be soon in market. The mouse is a miniature ring which can be worn on the finger and has 5 microphones to sense the movement of the hand. Depending on the motion of the hand the pointer moves on the screen and if you point it translates into a click.
Yet to hit the market I think this is a cool Innovation which deserves full marks on miniaturisation. My only apprehension is that the adverse affect of the ring as in the case of effect of mouse on wrists may not have been studied.