It's an adapter that cost around $120. Allows you to hook up your controller, a mouse, and keyboard to the adapter which then relays your keyboard and mouse inputs to the PS4/Xbone as if it was the controller. A lot of people who played PC shooters prefer to use a mouse and $120 is well worth being able to have that level of precision and comfort.
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Ooh not bad. I'd consider doing this if I played on a computer screen but I feel like a keyboard playing on a tv would be a bit clunky for me