This LiftMaster 81LM remote control is directly compatible with the Chamberlain 850CB as well as the following units:
LiftMaster 82LM, LiftMaster 83LM, LiftMaster 84LM, Chamberlain 850CB, Chamberlain 853CB, Chamberlain 856CB, Sears 139.53707, Sears 139.53870, Sears 139.53779, Sears 139.53879, Sears 139.53800, and Sears 139.53637SRT
Works with garage door openers that have the green learn button manufactured between 1993 to 1997 and one trinary (+, 0, -) code switch device on 390MHz. This item comes complete with a 2 year manufactuers warrenty, visor clip, battery and programming instructions.
