Awareness: The warranty interval for control boards with symbol is 150 times (calculated with the day of shipment), and those with no symbol aren't included with the guarantee. For those who have any dissatisfaction in the transaction or have important solutions for us, be sure to Speak to us by https://antminer-controll-boards09417.ampedpages.com/how-antminer-s9-control-board-schematics-can-save-you-time-stress-and-money-64383414