The WEN 4，000-Watt Inverter Generator provides clean energy， free of voltage spikes and drops for safe use with laptops， phones and other sensitive electronics. Our 212 cc 4-stroke OHV engine produces up to 4000 surge watts and 3500 rated watts of power. Designed to mirror a pure sine wave， this generator limits total harmonic distortion to under 0.3% at no load and under 1.2% at full load， making it safe to run sensitive electronics. The WEN Watchdog CO Shutdown Sensor helps protect both you and your family by automatically turning off the generator if dangerous levels of carbon monoxide are detected. Our ultra-efficient 1.85 Gal. tank provides over 7-hours of half-load run time. The fully-packed panel comes equipped with two 3-prong 120-Volt NEMA 5-20R receptacles， 2 5-Volt USB ports and 1 120-Volt RV-ready TT-30R receptacle. Maximize fuel economy by engaging the eco-mode switch. This allows the generator’s engine to automatically adjust its fuel consumption as items are plugged into and unplugged from the panel， preventing the unnecessary usage of gasoline. Easily link up 2 generators using a WEN Parallel Connection Kit (sold separately) in order to share wattage amongst multiple units. Low-oil and low-fuel automatic shutdown combine with the built-in overload protection and indicator lights to safeguard both your generator and your electronics from damage. And because its a WEN product， your open frame inverter generator comes backed by a 2-year warranty.