I may be wrong, but I don't think that's a Huanyang. The genuine Huanyang VFDs are not bad units. A cheaper clone maybe from ebay? The Huanyang that I have, the lower buttons aren't red and green. It says HY, not "Inverter" on the lower right panel, so the controls/functions settings may be different. I know some of the clones also have a single row of terminal connectors vs 2 on the Huanyang along with other differences.