In the event that the hashrate of your sent mining unit is decrease than 300TH/s, BITMAIN will refund the real variance Based upon $/T. I am extremely satisfied with my buy (Elphapex Dwelling). Furthermore, I must thank Faye for the excellent support she supplied; she answered all my issues https://buy-bitmain-antminer-s2342739.pages10.com/bitmain-antminer-pricing-explained-for-buyers-74739533