One of these is the photo eye sensor which was federally mandated in january 1993. All openers manufactured after that date are required by federal law to have photo eye sensors. They also work with moore o matic challenger and raynor garage door openers.
Universal Wireless Keypad 387lm This Replacement Wireless Keypad For Liftmaster Sears Chamberlain Genie Garage Door Opener Keypad Liftmaster Overhead Door
