This device plugs into a spare receiver channel. A must have safety device for any gas powered plane, allowing you to safely kill your engine at anytime(on the ground, or in the air.) Or when out of control also allows kill the engine.Features: This device allows you to safely and remotely kill your electronic ignition equipped engine form your transmitter.This kill switch is fiber optically coupled to isolate your ignition system from your radio system.(no interference).Including a remote mountable bright LED to indicate when the ignition is armed.Fiber optic coupled input/output. PIC12F675 controller. Li-Po/Li-ion/A123/Ni-Mh/NiCad input.Up to 20 Volt 16 amp MOS-FET(IRF7456) output. Low to 3 Volt 3 amp output. 100% surface mount technology.Heavy gauge wires, universal connectors.Small and light weight-only 0.3 oz(8g).Shut down the transmitter power or receiver to cut off automatically when kill engine.Specification: Material: PCBSize: Approx. 38 * 18mm / 1.5 * 0.7inchTotal Weight: 15gType: RC Part & AccessoryPackage List:1 x Switch1 x Manual