Here, the in USA anything you connect to the grid MUST be UL certified, otherwise you risk killing a power poll person,
IF you go look at the specs of this piece of crap, you'll see the AC freq is way out of control range for even the worst USA gird line.
A US seller doesn't mean squat, you buy it and connect it to the grid, and hurt someone besides yourself you go to jail, simply put.
Here's a *bay link go read 2/3rds the way down read the specs, show them to a lineman and wait for their reaction.
Bruce S