If I want to buy a Bluetooth headset to use with the PS4 multiplayer game modes what type of headset do I need to buy?
It will support any Bluetooth headset. You should be able to connect any headset used for phones or any other Bluetooth enabled device. A headset doesn’t need to be specifically made for the PS4. Any headset that says it has been optimised for the PS4 is just doing this to get more sales.