[. . . ] Smart/Learn button or DIP Switches are located on motor unit or external receiver. [. . . ] â· ALWAYS keep gate or garage door in sight until completely closed. See Chart A to determine # of times to press button and write in blank on step 5. cHART A # of times to press button 1 2 3 4 5 6 7 9 11 Brand Type/Color of Smart/Learn Year # of times to press button 11 12 13 14 15 16 17 18 19 Brand See Chart B to determine # of times to press button and write in blank on step 5. *NOTE: LiftMaster, Do-It, Master Mechanic, Raynor, True Value and Sears Craftsman are compatible with Chamberlain technology. NOTE: Your opener may appear different and you may have to remove the light lens to access the learn button. Code is accepted when one of the following occurs: Press button times ensuring LED stops flashing after each press. NOTICE: To comply with FCC and or Industry Canada (IC) rules, adjustment or modifications of this receiver and/or transmitter are prohibited, except for changing the code setting or replacing the battery. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. [. . . ] If you already have a 3-button remote, DIP switch #1 must be set to "-" if the large button is to open the door. [. . . ]