The Drift Fix PCB will allow you to fix your failing analog sticks that are drifting and bring them back to like new performance (as long as the original Potentiometers are not damaged) extending the life of your controllers. To configure the correct center position plug the controller into a PC or M@C and head over to gamepad-tester. Once the controller is recognized by your operating system, adjust the 2 potentiometer screws with a philips screwdriver on the PCB Board to bring the analog stick back to the center, then close up your controller and it's as good as new. Compatible with P4, P5, Xb0x One, Xb0x Series S & X , First Gen Xbox Elite, Xb0x Elite Series 2, Switch Pro Controllers. (CAUTION: some modification of housing required for Switch Pro controller) You get TWO drift fix PCB flex per pack, Enough to fix the left and right analog modules in one controller, Simply solder it to back of the analog stick solder points to install the PCB. What's in the Box 2x Stick Drift Fix Board