Garage Door Opener Visor Remote Control Button 81LM REPLACEMENT REMOTE compatible with LiftMaster and Chamberlain 390Mhz 81LM REPLACEMENT REMOTE compatible with LiftMaster and Chamberlain 390Mhz billion code systems. GREE Charcoal, One button Programmable, Visor Clip 390 MHz, A23 12V Battery 390 MHZ Freq, compatible with Liftmaster Sears Chamberlain Craftsman operators manufactured from 199