Purchased a BBS02 from Ewan since there were good reports about his prices and assistance. He was very helpful during the purchase. However, recently I had a problem with the unit and asked him very courteously on two occasions a few weeks ago if he had any knowledge of the phenomenon. I didn't mention warranty except to say it was something that I was more than willing to pay for. He didn't respond to either request and at this point I don't expect one. Buyer beware and might as well go directly to China to receive the same non-existent after sale service.