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The RB709 Garage Door Opener Adapter enables the Mighty Mule transmitters to open and close almost any garage door opener. Made to be used with the RB742 (two button) and the RB743 (three button) remote control transmitters. Easy to install with almost any garage door opener. One RB709 is needed for each garage door opener that will be controlled by the Mighty Mule transmitters. Compatible items by GTO. GTO Mighty Mule 2 button remote. GTO Mighty Mule 3 button remote. GTO Mighty Mule Push Button Control.