1. Low Operating Cost and Noise, High ROI and Longevity 2. Low Energy Consumption(2200W) and High Hash Rate (32t) 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 be sure to use 220V- 240v voltage for this model machine. 7. Please note: this model machine is used Refurbished one. it's really like new