ebang company has been very bad with customer... long waiting for replies, and then quoting high shipping fees... I think they would favour for bigger investor but still with this kind of manner, I wouldnt even invest in their product, just incase down the track one of the board is bad, gonna wait for like years to get it fix(im just exagerating but who knows?). I hope some one get better experience than I. but just my 2c, I tried to order one from them just didnt work out for me they offered return of money but my money were stuck with them for like 1 week. could have invested else where.