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 load, making it safe to run sensitive electronics. Our ultra-efficient 1.85 Gal. tank provides over hours of half-load run time. The fully-packed panel comes equipped with two three-prong 120-Volt NEMA 5-20R receptacles, two 5-Volt USB ports, and one 120-Volt RV-ready TT-30R receptacle. Maximize economy by engaging the eco-mode switch. This allows the generator’s engine to automatically adjust its 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.