Dude i dont even know what this it is

It's a device that allows you to hook up a keyboard and mouse or other gaming paraphernalia to have the physiological effect of making you think you're doing better when in actuality consoles games have been so optimized for the controller with things like aim assist it makes the effectiveness of the device highly debatable.

I couldnt imagine using a mouse and keyboard. Sounds lame or for scrubs aim botting

Yeah. It can also let you use any of your PC peripherals with xbox/ps ect. Works within the limitations of the game and the controller. I recently dug out my PC racing wheel started using it to play forza, which is cool. I don't mind playing racing games with the controller but a wheel is more fun.