AIMS Power 3000 Watt Pure Sine Low Frequency Inverter with built-in battery charger and transfer switch. This inverter charger is perfect for small-sized industrial applications that depend upon power being available even under heavy load. This heavy-duty inverter charger is ready to go wherever you need it. Use this product for renewable solar, off-grid home and business back up power, mobile and emergency backup power applications anywhere that uses 110 or 120 volts of alternating current. This product also has auto frequency detection that allows users to operate at either 50 or 60 hertz. Use this product to power your essential household appliances during a power outage emergency.