Controller takes up USB on Android devices but has BT and wifi integrated...
Hi @88uh55r3w2,
According to the Google support page the Stadia controller should work over WiFi when your Android phone is Android 10 or higher.
Stadia controller has integrated microphone and sends periodic encrypted binary data to Google servers even while no game or Home are running.. Google will not allow it to be used where it can't communicate with their servers...