The rated working voltage 220v?0% 50hz Output power/rotating speed 550w/1400r/min The start pressure (in running) 0.45mpa(0.1`~0.8pa) The stop pressure (in running) 0.75mpa The max working pressure 1 mpa The rated exhaust capacity ≥55L/min(0.4mpa) The tank cubage 22L Gross weight 38KG Net weight 25KG Noise ≤58dB(A) External packing size 45*45*67