So you are planning to use European or Chinese appliances in the US? You are going to need a 220v outlet. The UMI Step Up 110V to 220V Voltage Converter can help. It is 2000W rated and has two outlets. It comes with safety features such as short circuit and surge protection.
The unit has a convenient display to show input and output voltage. It also has a plastic shell for proper insulation. It is compact but weighs 7.5kg.