The EF6600DE is the best-selling generator in Yamahas industrial/contractor lineup with the convenience of electric starting, automatic choke, and remote starting capabilities. Dual voltage - 120 and 240 Volt operation. OHV engine (overhead valve) - precise valve actuation and heavy-duty design offer improved efficiency, reliability and quite operation. High temperature/ high pressure engine casting process creates stronger components and increased durability. Cast iron cylinder lining provides optimal heat dissipation, consistent performance during continuous use and long engine life. Brushless alternator provides low maintenance, years of worry-free service, and optimizes tool performance. Oil watch warning system automatically shuts off before oil level is low and cannot be re-started until oil is added. Prevents engine damage and costly repairs while enhancing long-term durability.