... noise Safe,reliability Energy saving Oil-free Air Compressor Pa-1EW-32 Voltage/Frequency110V/22V AC 50HZ/60HZCurrent2.4APower ... characteristics of dental treatment: big flow, low noise, clean dry gas source, run smoothly, long usage-span, low failure rate, and ... it is running, if the gas pressure get to the minimum set or maximum value, the compressor will automatically reboot or shutdown ...