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. Power up the 459 cc champion engine with the handy rocker switch, battery included. 11500 starting watts and 9200 running watts, enjoy up to 10-hours of run time on a full tank of gasoline with a noise level of 74 dBA from 23 ft. 120-Volt/240-Volt 30 Amp locking, 120-Volt/240-Volt 38 Amp and four 120-Volt 20 Amp GFCI outlets - volt guard built-in surge protector prevents overloads and keeps your appliances and equipment safe. Keep track of voltage, frequency, session run time and total run time to easily monitor output and track maintenance intervals. Item includes: battery, wheel kit, engine oil, oil funnel.