I will not recommend to buy any product on minerbases.com / Leed Technology. The service to this company is really bad. I buy an asic miner worth $6000 and paid $350 for UPS shipment. 4 days since the payment is made, the product still sitting in the warehouse. and no update at all. i think this people dont care others people money as long as they are getting from you. secondly a day after i purchased my product, I changes my mind and want to upgrade my product. but they dont want too and while they let my product sit in the warehouse. Becarefull guys dealing with this seller.