Bitmain AntMiner U3 Bitcoin Miner Version 2 Voltage: DC 12V input, 6A, Max Hash Rate: 60-63 GH/s 5% USB connection Compatible with Windows/Mac One 80mm fan, Hashrate and VDD core voltage can be adjusted via cgminer command line Power Efficiency: 1Watt/GH/s on wall at 0.83V 12V AC/DC power brick of 6A (included), Powerline should be purchased seperately