Overhead Door® openers and wall consoles integrate various technology. The technologies are known as Series I, Series II and Series III. Series II is backward compatible to Series I. Series III is not backward compatible without additional purchased parts. Contact your Overhead Door™ Distributor for further details. If the date code of your opener is 041217 or higher, you can use a Series II wall console with your opener. If not, you must use a Series I wall console for your opener.