The Chamberlain 940CB / LiftMaster 877MAX wireless digital keyless entry keypad works on all LiftMaster, Chamberlain and Sears Craftsman garage door opener and radio receivers that use security+ versions of remotes on 390Mhz frequency manufactured between 1997 and 2005 that have the RED or ORANGE learn button. The LiftMaster 877MAX wireless keypad can control multiple garage door openers within its signal transmission range by setting different 4 digit PIN code for each door. This wireless keypad also allows the user to set a temporary PIN number that can easily be deleted directly from the keypad