Kit includes all components and instructions to make an electronic sound effect generator that is designed to sound like a Ambulance Siren. Great for sound effects on a model railroad, display scene, or just for the fun of it. Add a magnetic switch to turn it on and off with a small magnet mounted on a train car and have the effect start when a train passes by. Add our other effects generators to make the railroad or scene come alive with sounds. You could even add remote switches on the display to start the sounds individually.