Sears Craftsman 139.53661SRT3 Remote is Equivalent to the 971LM Equivalent to the Sears Craftsman 139 model number listed above Security Plus remote that is compatible with models manufactured from 1997- present Operates on a 390 MHZ Frequency, and has over 100 billion codes with code rotating technology A visor clip and Lithium battery (5 years life w/ normal use) are included, along with instructions Compatible with ALL Security+ systems