TR-5000 5000 Watt Step Up / Down Voltage Transformer Converter/Regulator. This converter is used for small/medium sized electronics or appliances for use in different countries. It can convert 110v power to 220v as well as convert 220v power to 110v. Line frequency input = output. It is a heavy-duty converter that can be used continuously at rated power. It also stabilizes the output power.