VIAIR 45053 Silver Automatic Portable Compressor Kit (450P-RV) 12 VOLT - 150PSI Max Working Pressure, engine must be running during use 1.80CFM Free Flow at 0 PSI Powered direct to the RV or car 12v battery with alligator clamps Comes with a tire inflation gun and gauge, build in pressure switch, air hose, RV accessories and a carrying case Great for adjusting tire pressure on RVs and trailers