Auto Cut Switch has been designed primarily for use with BEC receivers. The Auto Cut Switch will cut power to the motor when the output voltage of the NiCad power pack drops below 4.3-4.5 volts, leaving enough power to operate the receiver & servos so the model can be landed safely. Connect the Auto Cut Switch to the motor & receiver (we recommend you fit suppression to the motor to prevent radio interference) mount the ON/OFF switch and the arming button into the fuselage and that's it! When you are ready to fly, press the arming button and the motor will start immediately. For use with 2 Channel BEC type receivers.