Rare Bitmain S4+. 2.57 TH/s @ 1400 w. 1600 Watt PSU integrated with LED status screen. The included PSU cannot be used in countries with a mains power voltage lower than 208 Volt. The PSU will not start below this voltage. Stand alone unit, no PC required! No messing around with cables and second hand server PSUs, just plug in and go! Do not buy this unit expecting it to work on 110 volt. If you cannot scan your LAN / DHCP range, this purchase is not recommended.