... :50HZ/1500RPM,60HZ/1800RPM Three phase coltage Available:400V/230,380V/220V,480V Single phase:available:110V,120V,220V,240V ... ,oil level indicator, emergency button,preheating button, battery voltage gauge, hours running counter for protection and tranfering.2 ... electricity, remote monitoring, automatic parallel operation,etc…(4)Warranty policy Guarantee for one year or 1000 hours whichever reach first ...