A pneumatic effect that uses a high quality truck air horn as a startle scare. Included is the truck horn, solenoid valve and regulator. All you have to do is hook up an air supply and a power source. The air inlet on the valve is a 1/4″ push to connect fitting for tubing. If you need to hook this prop up using a standard compressor fitting, let us know, and we can swap it out for you, or you can just buy one of our adapters. The solenoid valve is 12vdc. This allows you to use a variety of sensor and controller options. If you need help picking a controller or sensor for your prop, please let us know and we can help.