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Once all components are installed and powered, open the cover on the main garage door opener unit to access the programming buttons. Follow the instructions in the manual to set the door's open and closed travel limits. Typically, this involves putting the unit into 'learn mode' by holding a specific button (e.g., the black button), manually moving the door to the desired open height, and then holding another button (e.g., the yellow button) to move the door to the desired closed position. This process teaches the opener the full range of motion for your specific garage door, ensuring it opens and closes to the correct points without excessive force or incomplete travel.