A method and apparatus is provided for sensing, encoding and transmitting electronic keyboard data, pointing device control signals and voice input. The apparatus includes a wireless device appended, for example, to each wrist of the operator. The wireless device utilizes an optical reflectance matrix...http://www.google.fr/patents/US6097374?utm_source=gb-gplus-shareBrevet US6097374 - Wrist-pendent wireless optical keyboard
