Chamberlain LiftMaster 422LM Universal 2-Channel Coaxial Receiver Can operate two residential garage door openers with series 60 controls (LiftMaster Digital - red LED light). You can instead use up to four remotes/keypads from the 80 series (Billion Code - green LED light). Powered with 18-35V AC/DC. Included: 8" external whip antenna. For use with openers operating at 390MHz.