Bestdotek&reg; Rcexl rc Opto Gas Engine Kill Switch With Futaba Plug DLA DLE DA Ignition Cut Off [1]This device allows you to safely and remotely kill your electronic ignition equipped engine your transmitter.igniton system is Fiber Optically Coupled to isolate your igniton system from your radio system .(No Interference!!) [2]This device plugs into a spare receiver channel [3]This is a must have safety device for any gas powered plane! [4]This device allows you to safely kill your engine at anytime (on the ground ,or in the air!) Or when out of control also allows kill the enfine [5]Shut down the transmitter power or receiver to cut off automatically when kill engine