There are some customers asked us, some keys don't work, and the trigger problem, is the quality problem? How to fix it?

Actually is not a big problem, and not a quality problem, it can fix easily. All we can do is to calibrate the keys. 

Following the below steps :

1. Download the CalibrationLite here: https://drive.google.com/drive/folders/1WvbNyWvnkHzagowmQ9wBLRgMqjBvenkQ?usp=sharing

2.  

3