Check the listing for details. Evolution Optical Kill Ignition Engine Switch for Gasoline RC Airplanes EVOA100. Condition: New. Listed at 24.95 USD. This is the Evolution Engines Optical Ignition Engine Kill Switch. A must-have safety device for any model with a gasoline engine, with the Evolution Optical Electronic Kill Switch you can kill your gas engine remotely from your transmitter without having to touch your model. The kill switch is fiber optically coupled to isolate your radio system from the ignition system so you won't have to worry about interference. Features: Remote LED to indicate if the ignition is liveFiber optically coupled to eliminate interferenceLi-Po/Li-Ion/LiFe/Ni-Cd/Ni-MH compatibleOutput range from 3V, 3 amps up to 20V, 16 ampsMinimal voltage drop, less than 150mvSurface mount technologyHigh-quality wiring with universal servo connectorsOnly 0.3 oz/8 gAutomatically shuts down power to the ignition on loss of signal Specifications: Length: 1.50 inch (37mm)Width: 0.67 in (17mm)Height: 0.30 in (7.5mm)Weight: 0.30 oz (8 g)These have now been updated to have the Spektrum Sticker on them. Exact same product.