This product is advertised on Amazon as being suitable for USA polarised two (uneven) prong sockets. However when it arrived the product spec was described as "for UK, Hong Kong, Singapore & more" It said nothing about being for USA polarised plugs. There was an entry under "other information", which stated "all electronics have US plugs". The plug itself came lose wrapped in cardboard with no manufacturer details or guarantee. When I tried to use the device, as advertised, with a USA polarised plug, my USA appliance flashed bright yellow, and, with a bang & pop blew up! Thankfully it fused out & nobody was hurt. I have lost a $200 appliance...you've been warned.