Pulse adjustment mode, the neutral point output function and automatically adjust the pulse width ,you can toggle switch to select one of three models to test.

Mode Select: automatic , manual adjustment , automatic neutral point signal output

Using manual adjustment , the knob can work,you can adjust the Output pulse width or the ESC or control servo Arbitrarily.

The Neutral point can find the middle point of the servo.

Automatically adjustsment can make the servo Rotate back and forth.