 how you're pulling the trigger. Do you pull a gun down? Do you go up with it? What exactly are you doing? Pulling off to one side, and it shows you in real time, after you connect it to your iPhone or your Bluetooth device, it will show you exactly what you're doing and how to correct it. It's really easy to use. The Marines have been using this. Now it's used military-wide. It's MantisX, M-A-N-T-I-S-X, MantisX.