The Skybell comes with a small round plate which does not matches the size for standard rectangular boxes. They do not provide an adapter for them.
I had to make my own since I tried to contact them via phone and also at their website by submitting a ticket. Nowhere in their website they address this issue.
Bottom line I took the time to make the adapter because I got it as a gift from my son and did not wanted to let him down, if not I would had return it since for the price they charge they should had considered designing and including a plate for this case. Bad engineering/product design and bad customer service.
Review about: Skybell Doorbell.
Reason of review: Poor customer service.