To use them you have to pry off the back of the handles (the blue tool is kinda useless for this), then unscrew the 5 screws (2 each) on the back of the handle and the hidden screw under the information sticker in the battery compartment). A screwdriver is handy if you don't already have a Torx screwdriver. Enough parts for two controllers. $12 is a bit pricey, but it's a vanity thing. It will not help your controller perform better. It's easy for you to enjoy.
Microsoft Xbox Wireless Controller Adapter for Windows 10 Black
25 Review
Organize Your Nintendo Games With Sisma'S 72-Game Storage Case: Compatible With Switch And DS 3DS Cartridges - Grey
13 Review
Wireless Xbox Controller With Audio Jack - Compatible With Xbox Series X/S, Xbox One, And PCs Running Windows 7/8/10 - Red
16 Review
Computer headset Razer Blackshark V2 X, green
86 Review