The 81LM, or LM81, is the second to oldest transmitter still made by Liftmaster. They only make this transmitter with a single button. Liftmaster is also relabeled by Craftsman, Chamberlain, and a few other companies. These xmtrs were used probably in the late 1980s and possibly early 90s.

Click here to view the original instructions that came with the remote.

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