This Jdmspeed on-board air system is built for serious truck and vehicle applications! The 150 PSI DC 12V compressor paired with the 3-liter (0.8 gallon) air tank provides plenty of power for air horns or other air accessories. The compressor itself measures 15.75x5.125x6.75 inches, giving you a compact but powerful unit that fits in most vehicle installations. The included 1.8 meter hose with 3/8 inch diameter provides good reach for installation flexibility. The built-in 0-140 PSI pressure gauge lets you monitor your system easily, and the 90/120 PSI pressure switch automates the compressor operation. The thermal protection is smart too - it automatically shuts off at 80°C and restarts at 70°C to prevent overheating damage. The metal housing construction feels durable and designed to handle vehicle vibrations and conditions. The package includes everything you need for installation - the compressor with tank, hose, brass fittings, fuse, fuse holder, and mounting hardware. This system is ideal for powering train air horns or any high-pressure air accessories that require a reliable on-board air source. If you're adding air horns to your truck or need a capable air system for other vehicle applications, this Jdmspeed compressor and tank combo is absolutely worth considering. It's one of those upgrades that seems like a luxury until you have it, then you appreciate the convenience and capability it adds to your vehicle.