I recently noticed that macOS has an icon for every W1 enabled audio device in the Bluetooth preferences, but I'm not exactly sure where the system gets these icons.
In the screenshot below, the Beats Solo³ and AirPods were paired to my iPhone, and iCloud paired them to my Mac. It looks like the color of the Beats headphones in the icon do match the color of the real headphones as well!
I assume that either macOS has the images for every W1 stored somewhere or the system had to contact Apple to get these images. Just in case, I did check the following directory: