1. PLEASE NOTE: This is a refurbished machine really looks like new (give away 220v PSU) 2.We Will Debug The Antminer Before Shipment to Ensure Full Matched Hash Rate and Working Well. 3.Double front and rear fans, independent heat sink, better heat dissipation 4.The chassis is made of aluminum alloy, and the surroundings are integrally formed. Each chip has an independent heat sink, and the overall structure is more compact 5.The heat sink adopts a new bonding technology to make the body more robust