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This Series III Dry Contact Adapter has been developed as a solution for openers that use Series III technology, making it possible to use common ‘on/off switched’ inputs when required with these garage door openers.
This piece goes in between the switch and the series III wall console input
Examples of such switches include doorbell switches, typical key switches, and other aftermarket accessories
If your garage door opener has a wired gray wall console with black buttons, you have an opener with Series III electronics