This is a true sine wave battery based power inverter. It produces 4000 watts continuous with a 10,000 watt surge rating. It produces 120 volts AC. It requires a 24 volt battery bank that is not included. Included in the offering is a 250 amp main disconnect breaker in an enclosure. A 30 amp 24 volt breaker if 24 volt accessories are added. A battery temperature sensor, a totaling amp hour meter with dual shunt and shielded cable and approximately 8 feet of copper 4/0 battery cables. Complete original manuals for inverter and meter. This unit has a built in 24 volt fully programmable battery charger that can be used with an AC source such as the grid or a generator. Everything works great!