The Champion Power Equipment 100416 8000-Watt Tri-Fuel Portable Natural Gas Ready Generator with CO Shield is a reliable source of power with the flexibility you need. The ability to operate your generator on three types of fuel out of the box makes this one of the most versatile generators on the market. The electric start includes a battery, plus Cold Start Technology ensures quick cold-weather starts. Buy this EPA certified and CARB compliant generator with confidence – 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. CO Shield technology monitors the accumulation of carbon monoxide (CO), a poisonous gas produced by engine exhaust when the generator is running. If CO Shield detects unsafe elevated levels of CO gas, it automatically shuts off the engine. CO Shield is not a substitute for an indoor carbon monoxide alarm or for safe operation. DO NOT allow engine exhaust fumes to enter a confined area through windows, doors, vents or other openings. Generators must ALWAYS be used outdoors, far away from occupied buildings with engine exhaust pointed away from people and buildings. Meets the requirements of ANSI/PGMA G300-2018.