Sears Craftsman 139.53975SRT1 Remote is Equivalent to the 971LM

This Liftmaster 971LM is equivalent to the Sears Craftsman 139 model number listed above. The back of your garage door opener motor should have a SMART button that is Red/Orange Color to be compatible. This is a Security Plus remote that is a 1 channel/button transmitter, compatible with models manufactured after 1997. It operates on a 390 MHz Frequency, and has over 100 billion codes with code rotating technology (Security+). A visor clip and battery are included, along with instructions. Compatible with ALL Security+ systems, including Chamberlain, Sears, Craftsman and Raynor code rolling residential openers. The corresponding wireless keypad is the 976LM wireless keypad for Security Plus 390MHz garage door openers.