Specification :

power inverter with charger.
the function are the same as the same Watt power inverter.

but this one can charge to the battery with the AC electricity.

when you are outdoor, there isnot AC electricity, you can connect to the battery and transfer the DC to AC.

ONS Inverters convert DC battery power from a vehicle into AC power to operate electronics, appliances and tools, such as a small refrigerator, vacuum cleaner, TV, stereo, drill, jigsaw or computer on board your vehicle, boat or RV. Each model includes one AC outlets, two ammeter .high surge capacity and protection features. The higher powered 1000 and 1500 watt models feature mounting brackets, and are a great power source for contractors who want to operate power tools near a work vehicle.