While many players who play on pad swear by the PlayStation 4 controller, there are still a few holdouts that prefer Microsoft’s pad offerings. For those that do, Brook now sells the X One adapter, which works wirelessly with the Xbox One controller and syncs with the PlayStation 4 and Nintendo Switch.
The adapter acts as a wireless sync and a battery replacement for the controller, and adds very little heft to the controller. It also allows you to use Xbox one compatible headsets on your PS4, and has a lot of functionality that is useful for training mode in games such as Street Fighter V.
In this video, Jonyfraze describes the adapter, and praises it for its usability and lack of heft — but notes that the protruding bluetooth sync may cause problems for some players.
Source: Jon Bonilla