https://www.walmart.com/ip/3000-Watt-Step-Up-Down-Voltage-Transformer-Converter/655554409
it's nice to have regardless because you can essentially get 220 volts out of any 110 outlet. I have some 220v tools that I need to be able to use away from where I have a wired outlet. Rather than lugging out a generator with a 220v outlet, I can just plug this into any 110 outlet and get my 220 volts. It goes the other way as well and steps down 220 to 110.