Remember when you had clean and quiet portable power? 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 212cc 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 percent at no load and under 1.2 percent at full load . making it safe to run sensitive electronics. Our ultra-efficient 1.85-gallon tank provides over 7 hours of half-load run time. The fully-packed panel comes equipped with two three-prong 120V NEMA 5-20R receptacles . two 5V USB ports . and one 120V 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. Need more energy? Easily link up two 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 two-year warranty . a nationwide network of skilled service technicians . and a friendly customer help line . all to make sure you remember WEN.