So you would like to use European and Chinese appliances in the US but don’t have a 220v outlet around? The PPT-2200 2000W step up & down voltage transformer can help. It automatically recognizes the input voltage and converts it from 110v to 220v or vice versa.
The Yinleader PPT-2200 has 2 x 110v sockets, 2 x 220v sockets, and a USB 5v port. It has a LED display to show the output voltage at any time.