the dongle is a usb wifi adapter with a tiny little usb a to microusb adapter, so I can use wifi if/when I need it since the cm3 doesn’t have wireless.

EASTECH Ralink RT5370 Raspberry... https://www.amazon.com/dp/B019XUDHFC?ref=ppx_pop_mob_ap_share

and

CHENYANG Ultra Mini DM Micro USB... https://www.amazon.com/dp/B015GZOHKW?ref=ppx_pop_mob_ap_share