A wireless pointing device, such as a computer mouse, employs self-generated electric energy to power itself and to recharge its internal energy cell. The self-generated power may come from a flywheel coupled to a generator, from a photovoltaic cell, from a secondary coil inductively coupled to an alternating...http://www.google.de/patents/US7158116?utm_source=gb-gplus-sharePatent US7158116 - Rechargeable cordless input and pointing device
