How do I tell the difference between the various Nyon products (BUI275, BUI350)?

There are of course many differences between the two Nyon models. The easiest way to identify the new Nyon (BUI350) is that it has a portrait format display, while the older Nyon (BUI275) uses a landscape format and is also significantly larger. There is also a laser inscription on the back of the devices showing the product designation, BUI275 or BUI350.