one for one set of comprehensive dental chair Power Supply 110-240V/ AC50/60HZ Power 545W Flux 76L/MIN(0.4MPA) Noise 60-70DB Max Pressure 0.8MPA Start-up Pressure 0.5MPA Rev. 1400R/MIN Capacity 32L Meas 423*423*610(MM) Weight 28.00(KGS)