Sears Craftsman LiftMaster Chamberlain
Garage Door Opener Plug-In Receiver
and 3 Transmitter Set 635LM-3T 
LiftMaster Garage Door Opener Receiver and 3 Transmitters 635LM-3T 
Garage door opener receiver and transmitter set with Security+ technology, replaces pre-1983 receivers with discontinued transmitters (includes 1 receiver and 3 transmitter)
Easy to install, simply use your existing wall buttons' wires and plug into a wall outlet, that's it!
The code between the remote and receiver changes with each use
Over 100 billion possible codes using Security+ remotes, however, this item will accept ALL older remotes as well
Accepts multiple remote controls utilizing up to 8 functions, and one Security+ keyless entry
Will work with Lift-Master, Sears, Craftsman or Chamberlain remotes
635LM Programming Instructions
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