Yes, you can connect GDB remote device either to the back of the wall button or the terminals on the opener.
Can I connect GDB remote device to the wall button?
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I have two garage door openers, how many GarageDoorBuddy do I need?I have two garage door openers, how many GarageDoorBuddy do I need?
One GarageDoorBuddy supports up to 2 openers. In this case, you only need to get one.
How can I integrate this device to my home automation system?How can I integrate this device to my home automation system?
You can enable the developer mode on the app first. Then use the REST API. Please refer to GDB Developer Mode guide for more information.