A:AnswerPretty sure this adapter will work for any Xbox sanctioned headset. However could not get it to connect to Xbox and my PC at the same time. MY Headset (Razer Kaira Pro) will connect to my PC via bluetooth though while connected to Xbox. Which pretty much renders this dongle useless to me. But if you just want a headset to PC connection you're good to go with this item.
A:AnswerNo this is a windows device
If your controller is an Xbox one or newer it can be discovered via Bluetooth if your TV has Bluetooth connectivity but you can only connect 1 controller via bluetooth
A:AnswerYes. This particular model works with PC, Xbox 1, and Xbox Series S and X.
There is a different model that works with PC, Playstation 5, and Playstation 4.