NorthStar Portable Diesel Generator - 6500 Surge Watts, 6120 Rated Watts, Model# 165930 Four 20 Amp 120V GFCI-protected receptacles One 30 Amp 120V locking plug receptacle One 30 Amp 120/240V locking plug receptacle Uses NEMA 5-20R, NEMA L5-30R and NEMA L14-30R plugs Brushless generator heads are proven to be superior in efficiency, performance and lifespan compared to brush-style generator heads