2 garage door remote opener for liftmaster 971lm (1997-2005) red button - security+ 390 mhz tck tech replacement aftermarket remote compatible with the following part numbers:<p>chamberlain: 950cb, 953cb, 956cb, or keyless entry 940cb<p>liftmaster: 970lm, 971lm, 972lm, 973lm,974lm, or keyless entry 976lm<p>sears/craftsman: 139.53681 or 139.53680<p>