The Flatlaw 3 Liter Train Horn Kit is a practical and efficient solution for adding a powerful train horn to your vehicle. This kit includes the Flatlaw Train Horn, a 3 Liter Air Compressor and Tank Combo, and operates at a pressure of 110 PSI with a restart pressure of 85 PSI. With a voltage of 12 Volts DC, this kit is compatible with most makes and models. The horn measures 17.5 inches in length, 16.25 inches in width, and 8 inches in height, while the compressor measures 16.535 inches in length, 4.921 inches in width, and 7.086 inches in height. Sold individually, this kit offers a practical and reliable solution for enhancing your vehicle's sound.