The Linear LDCO800 series garage door operators use the MegaCode series remotes. These are available in many sizes and styles, and can be viewed on our web site. To program a MegaCode series transmitter to the LDCO operator, simply press and release the "LEARN" button located in the center of the back of the motor unit in your garage. The red LED above the "LEARN" button will come on bright for 15 seconds. While the LED is on, simply press the button on the transmitter you wish to use. The LED will blink once to confirm that the transmitter has been learned. Repeat for any additional remotes.