The Champion Power Equipment 4250-Watt Open Frame Inverter Generator is one of the most innovative products on the market. A feature-packed addition to your RV and a cost-effective power solution . this inverter is smaller . quieter . and BETTER!First . we cut the noise level in half by integrating Quiet Technology digital components used in more advanced inverters . then we created an efficient mechanical design to decrease the overall footprint and weight by 20 percent.Operate your Dual-Fuel generator on gasoline or propane and safely switch fuels with our patented fuel selector dial.Using gasoline . the 224cc Champion engine produces 4250 starting watts and 3500 running watts . and will run for 22 hours at 25% load when the 4-gallon fuel tank is full. It produces 4250 starting watts and 3150 running watts . and will run for 21 hours at 25% load when using a 20-pound propane tank. A 6-foot propane hose with a built-in regulator is included.Cold Start Technology ensures reliable starts . Intelligauge monitors voltage . frequency and operating hours . while smart Economy Mode monitors the electrical load to reduce engine speed . noise . and fuel consumption.With a 0.5-quart oil capacity (included 10W-30) and a low oil shut-off sensor . this inverter operates at an ultra-quiet 64 dBA from 23 feet . which is a bit louder than normal speech.Confidently connect your sensitive electronics since this inverter produces Clean Power (less than 3% THD).Covered outlets include a 120V 30A RV (TT-30R) . two 120V 20A household outlets (5-20R) plus two handy 2.1A USB ports you can use to power your phone . laptop . or similar device.The optional Parallel Kit is sold separately and allows you to increase output by connecting up to two 2800-watt or higher inverters.Buy this EPA certified and CARB compliant generator with confidence ?C Champion Support and our nationwide network of service centers will back up your purchase with a 3-year limited warranty and FREE lifetime technical support.