I too am just about to purchase an Achieva Shimian QH270 lite from dhSummer and have been communicating with them for the last few days with questions. They have been extremely helpful and communicative. They told me they ship the FREE voltage bricks with their monitor that will work in the USA (120v 60Hz), however, you still need a C to A adapter so it will plug into the wall in the USA. They have these on Amazon for about $2.00 or less (search "VP7 ADAPTER PLUG" on Amazon). You can link your credit card to your PayPal account.
I suggest you confirm the above with dhSummer yourself before purchase.
FOR THOSE CONSIDERING PURCHASING THE OPTIONAL WARRANTY:
I was only considering purchasing the monitor with their 3yr. SquareTrade warranty for $34.99 that was supposed to be honored in the USA. However, today dhSummer took this option off their listing. So I called SquareTrade directly and received some interesting responses. Yesterday (when the 3yr warranty was on the listing), the SquareTrade representative told me it would be honored in the USA after the initial 45 days of ownership. Today, when I called SquareTrade (after finding the warranty was no longer on the ebay listing), the representative told me S. Korean monitors will not be warranteed by a SquareTrade waranty, an item would need a USA warranty to have SquareTrade coverage. Then we were disconnected, so I called SquareTrade back. The representative I spoke to in this latest call said, SquareTrade will provide a warranty on this S. Korean monitor if you warantee it on their (SquareTrade) sight. However, because it does not have a USA warranty, SquareTrade will consider it as being a USED ITEM (even though it is NEW) and it would not be eligible for a 3yr warranty! He said, for the same price ($34.99), I would get a 1yr. warranty and they could later continue the warranty for $17.50 for a second year. Unbelievable what you find when you dig and the different answers you can get. From what I've read, SquareTrade is a reputible company and their warrantees are good, but all these different responses are having me wonder about purchasing such a warranty on a oversees product. Or even taking the chance on purchasing from overseas. I read many people had good experiences, some had bad, so I am a bit more cautious now - but, who knows, I may take a chance.
If anyone has other information regarding the purchase of the optional warranty, I'd be interested in learning more.