1. Low Operating Cost and Noise, High ROI and Longevity 2. Low Energy Consumption(2200W) and High Hash Rate (30t) 3. 2 Powerful Fans Design to Cool Down Chips and Miner During Operation 4. No.1 Exporter of Miners on Overseas Market 5. this is double tube option 6. Please noticed that Due to the high power of machines, it is required to operate between 200v and 240v. 7. Please note: this model machine is used Refurbished one. it's really like new