I have one on my saito 180.
All you have to do is set the throttle to the position you want the driver to turn on and push the SET button. When the throttle goes below that position the driver will turn on.
The REV button is the same as servo reversing.
If it operates backwards then push the button.
It can operate with 1,4,6 cells.
Hopes this help's
Any other questions just ask I still have my inst.