I wish I could tell you, as I have just put it a new plane. It's controlled by a channel on the transmitter. Looks like a sweet deal though, no extra battery/switch to mount. I can maybe tell you better next week as I am about to leave sunny AZ, heading back to MI. When I get there, I'll be able to try it. I do like the thought of being able to turn off the ignition from the transmitter. If you look just above the fuel dot, the green light is the led for the ignition.