... 4.Noise:less than32dB M500air pump/mini air pump/massage machine pump/foot massage massage pump/aquariun pump/ ... are widely used in medical equipment,O-zone machine pump,electic tools,prevent cotton-padded mattress, massage ... customers need.remarkused in O-zone machine,air fresh machine,foot massage machine,vagetable washing machine,Washing machine,Air humidifier, automotive economizer,high quality ...