VIAIR 400P-Automatic Function Portable Compressor 12 VOLT - 150 PSI Max Working Pressure, engine must be running during use. 2.3CFM Free Flow @ 0 PSI Powered direct to the car battery with alligator clamps, comes with a 40 amp in-line fuse. Great for inflating tires up to 35inches on off-road and agricultural vehicles. Includes deluxe carry bag for the compressor, air hose, and tire inflation gun.