The present invention, according to a preferred embodiment, is directed to portable electronic devices which operate on exhaustible power sources, for example, batteries. The electronic devices of the present invention comprise at least one signal switch and a microchip in communication with the switch...http://www.google.es/patents/US7781980?utm_source=gb-gplus-sharePatente US7781980 - Intelligent user interface including a touch sensor device
Intelligent user interface including a touch sensor device
