Sears Craftsman 139.53978SRT1 Remote is Equivalent to the 971LM

This Liftmaster 971LM is equivalent to the Craftsman 139 model number listed above. The back of your garage door opener motor should have a SMART button that lights up an Orange/Amber Color LED Light to the remote. This is a Security Plus remote that is a 1 channel/button transmitter compatible with models manufactured from 1997- present. It operates on a 390 MHz Frequency and has over 100 billion s with rotating technology (Security+). A visor clip and Lithium battery (5 years life with normal use) are included along with instructions. Compatible with ALL Security+ systems including Chamberlain Craftsman and Raynor rolling residential openers. The corresonding wireless keypad is the 976LM wireless keypad for Security Plus 390MHz garage door openers.