Yamaha EF2400iS 2,400 Watt 171cc OHV 4-Stroke Gas Powered Portable Inverter Generator 2,400 Watt Maximum AC Output/2,000 Watt Rated AC Output Smart Throttle varies engine speed based on load Comfortable grip handles - Easy portability and storage. Super-quiet muffler with USFS-approved Spark Arrestor Inverter system with Pulse Width Modulation (PWM) control