Internal radio receiver. Compatible with the Overhead Door Phantom (model #777) CODEDODGER and Genie Intellicode garage door openers. Also part # 20437R
Part Numbers: 31171R, 36521S.S, 36521SS, 36521S, 36521, 36306S, 36521RS, 20437RS, 36521R
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Receivers failed with a lightning strike. Removed the old boards. Installed the new. Re-taught them, and all is well.