Description Our 4000-watt inverter is one of the lightest in the industry and features CO Shield carbon monoxide auto shutoff system. The Dual Fuel feature allows the 149cc engine to run on gasoline or propane. Enjoy the quiet 64 dBA for up to 10 hours on gasoline or up to 25 hours with a 20-lb propane tank and increase your power with the optional Parallel Kit.PRODUCT DETAILS:Dual Fuel: Operate your 4000-watt portable generator right out of the box on either gasoline or propane, plus features CO Shield carbon monoxide auto shutoff systemQuiet Operation: With an ultra-quiet 64 dBA from 23 feet, enjoy 4000 starting watts, 3000 running watts and up to 10 hours run time on gasoline, and 2700 running watts and up to 25 hours on propanParallel Ready: The optional, sold-separately parallel kit enables this inverter to connect with another Parallel Ready Champion Inverter or Power Station for more power and longer run timeClean Power for Sensitive Electronics: Includes a 120V 25A TT-30R outlet, a 120V 20 A household duplex outlet (5-20R) with clean electricity (less than 3% THD), plus a 12V automotive-style outlet, and Parallel outlets