1. 2x Hall Joysticks Replacement for Xbox – Hall thumbsticks work with Xbox One, One SX, Elite 1 and Series SX controller. With the electromagnetic hallstick Effect sensors inside, the control stick delivers higher sensitivity and accuracy. No more wear of traditional carbon film resistor, say goodbye to drifting. 2. 2x Addedon Calibration PCB – The tiny PCB was designed to stack on the back of main board. The moving signal is input to the high speed MCU. The calibrated signal outputs to the main board of controller. Connect the controller to a PC with a USB cable. You can fine reset the center and trim the curve via a web link. The accurate centering with no drift is essential for FPS aiming 3. Desoldering Tools included – A copper heating plate melts all the solder joints simultaneously simply with a soldering iron. Solder Wick, Holes Cleaner and simple PCB holder included. With as many as 14 prongs, removing the old problem stick is the most difficult task. It might is not suitable for bies. 4. Compatibility and Reminder – 1. Please carefully study the images for compatible controller. 2. The soldering iron must be more than 60W. And the operation takes serious soldering skill and devices to desolder the old stick off the PCB. 3. Seriously follow the steps presented on the installation guide as this kit is novel and tricky.