   Liftmaster 81LM Garage Door Remote Liftmaster 81LM transmitter
Chamberlain 850CB,853CB,856CB
Sears Craftsman 139.53707,139.53870,139.53779,139.53879,139.53800,139.53637SRT
390 MHZ Frequency, compatible with operators manufactured between 1993-1997
1 channel transmitter, compatible with the "Billion Code" series
Visor clip and battery included
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