CALIFORNIA AIR TOOLS SP-90407 (220 volts 60 hertz). Ultra Quiet & Oil-Free Air Compressor Pump/Motor. 2.0 HP (Rated/Running). The CALIFORNIA AIR TOOLS SP-90407 (220v 60hz) Ultra Quiet & Oil-Free Air Compressor Pump/Motor is designed to be one of the quietest in the industry having only 70 decibels of sound. The…