A universal remote control transmitter for use with garage door openers including a number of switches whereby a user can program a transmitted modulation format and carrier frequency, and a controller for scanning the switches to determine the user programmed selections. The controller, in response...http://www.google.fr/patents/US5790948?utm_source=gb-gplus-shareBrevet US5790948 - Method and apparatus for transmitter for universal garage door opener
Method and apparatus for transmitter for universal garage door opener
