PROTECTION CO Sensor – Engine shuts off if a high level of carbon monoxide is detected. Dual GFCI 120V Outlets – If the system senses a leak to “ground,” it automatically cuts off power to help prevent electric shock. POWER RV Ready – 30-amp RV outlet. Home Back Up Ready – Full power 120/240 dual voltage 4 prone outlet. Maximum AC Output – 5500 Watts RELIABILITY 3 Years Limited Warranty Low Oil Warning System — Shuts the engine off to protect the engine if the oil level drops. Durable Yamaha MZ360 Engine — Designed for long life. EASE OF OPERATION Electric Start — Effortless turn the key to start. Rugged Wheel Kit — Standard on EF5500DE and EF5500D. Fuel Gauge — Indicates amount of gasoline to indicate refueling interval. Digital Hour Meter — Total run time accumulation for servicing. Economy Mode — Determines load to adjust engine speed, helps reduce fuel consumption. 50 state legal – EPA & CARB.