Model 61LM (SCT61): 390 MHZ Frequency. Works on models from 1984-1992. Works with 8 or 9 three position dip switch systems. Visor clip and 12V battery included. Accepts multiple remote controls utilizing up to 8 functions, and one Security+ keyless entry. Will work replacing Lift-Master, Sears, Craftsman or Chamberlain remotes with the yellow LED light (Security+ format).
Model 971LM (SCTLMM): 1 channel/button transmitter, compatible with models manufactured from 1997-present. 390 MHZ Frequency, over 100 billion codes with code rotating technology (Security+) Visor clip and Lithium battery (5 years life w/normal use) included compatibility with all Security+ systems (Chamberlain, Sears, Craftsman).
Model 62LM (DCTLM): 390 MHZ Frequency. Works on models from 1984-1992. It has 2 sets of 9 three position dip switches. Visor clip and 12V battery included. Also compatible with wireless keypad model number 66LM.