The annunciator includes a visual display, wireless receiving circuitry for receiving, from a host device, data including selected information to be displayed, and software and/or hardware for maintaining the selected information displayed on the visual display of the annunciator. The circuitry of the...http://www.google.co.uk/patents/US6504580?utm_source=gb-gplus-sharePatent US6504580 - Non-Telephonic, non-remote controller, wireless information presentation device with advertising display
