Purchased a NXG-200 Garage Door opener and despite it saying it supported my Chamberlain model, it didn't out of the box. It required the additional NXAD-200 adapter, which cost $25 extra. Purchased one and later found out that I could have simply requested a free adapter by emailing Nexx and requesting one. Wish they had told me that before I spent the extra $$. In the end the adapter worked, so I'm content.