Chamberlain 950cb same as the 971lm 3 Button Security + Remote 390mhz Sears LiftMaster Compatible 971LM 972LM 973LM Security+ 3 Button Remote (390MHz) Product Features: -Activates 1 , 2 & 3 security+ device on the 390MHz frequency -Visor mounting clip included -3 volt lithium battery CR2032 included -Frequency: 390 MHz -Codes: Features rolling code technology -Dimensions: 3.0 x 1.5 x 0.6 inches Works with the Following Machines: LiftMaster / CHAMBERLAIN and Sears Craftsman (Openers with a RED Smart Button only)RAYNOR (Openers with a RED Smart Button only)AccessMaster (Openers with a RED Smart Button only)ALL LiftMaster, CHAMBERLAIN, Sears Craftsman Machines Manufactured between 1997 - 2004or - Any LiftMaster, Chamberlain or Sears Craftsman Machines that have one of the following PART NUMBERs on the end panel (you may have to pull off a light cover to find this part number)41A5021, 41A5021-A, 41A5021-B, 41A5021-C, 41A5021-D, 41A5021-E, 41A5021-F, 41A5021-G, 41A5021-H, 41A5021-I41A5021-1, 41A5021-1A, 41A5021-1B, 41A5021-1C, 41A5021-1D, 41A5021-1E, 41A5021-1F, 41A5021-1G, 41A5021-1H, 41A5021-1I41A5483, 41A5483B, 41A5483C,41A5483-1, 41A5483-1B, 41A5483-1C41A5483-4, 41A5483-4B, 41A5483-4C41A5389-1, 41A5389-1C, 41A5389-1D, 41A5389-1E41A5507, 41A5507B, 41A5507C, 41A5507-641A5021-1ATSCRAFTSMAN MODELS PART NUMBERS MAY VARY SLIGHTLY (LOOK FOR SMART BUTTON COLOR) Replaces or Works with the Following Remotes:LiftMaster - 971LM, 972LM, 973LM, 974LM, 976LM, 977LM, 96LM Chamberlain - 950CB, 953CBSears Craftsman - Check Learn Button or Part Number. Sears has too many Model numbers to list hereHOW TO FIND YOUR SMART / LEARN BUTTON or PART NUMBERYour Part Number and Learn/Smart Button are always located on the end panel of your garage door opener where the Antenna Wire comes from. You may have to remove a light cover to find them.