Seen in an FCC document, a prototype of an AirPort Extreme base station with a unique visual feature: it is entirely white.
The base station in question is the AirPort Extreme A1521 (which is Wi-Fi 5). It is normally white (for the casing) with a black bottom and a black Apple logo () on the top. The FCC version, however, is completely white, from the bottom of the case to the Apple logo on the top.
The Apple logo on top, white
The bottom, white
Another photo of the bottom
