The Killer RC Bumble Bee Nitro Killswitch™ will automatically stop the fuel flow to your nitro engine during: radio glitch/signal loss, low battery, cut wires, or total battery power loss. You can also kill the engine any time you want by pressing the Aux button on your transmitter, or turning off the transmitter power button. No more plugging the exhaust, jamming up the flywheel, or pinching the fuel hose.