1.OEM business is available: we accept OEM business from overseas ... .Built-in air switch: available in each Model No. Power310W (1/2HP)Voltage 220V Frequency50HZ RPM 1800R /MinMotor DC Perpetual MagnetismOverload Protection ... ,UL,ISO9001-2000,ETL,CETL,UPC,ROHS approved,1/3,1/2,3/4,1 horse power.UseageIt is one of new products ...