Viair (00077) 77P Portable Compressor Kit 12 VOLT - 80PSI Max Working Pressure, engine must be running during use. 1.06CFM Free Flow @ 0 PSI Portable air compressor powered by auxilliary power outlet. (The 85P can only be used if your outlet is rated to 15 AMPS/180 Watts or more) Easy to read tire pressure gauge mounted on the compressor. Super bright LED work light included. Engine must be running when in use.