GekkoScience Compac FS7 300Gh/s+ USB Bitcoin / SHA256 Stick Miner Most Efficient, Powerful USB Miner on Market

Brand new usb stick miner manufactured in the USA by legendary GekkoScience (Sidehack) using S17 BM1397 chip. Currently the most efficient USB miner ever manufactured. You must provide extra cooling (table fan, usb fan, etc) when running the miner because these can get very hot (especially when running over 400 MHz frequency) Requires powered usb hub that can supply 2 amps per port! Top speed running on 800MHz with 5 amps (25w) per port per usb miner is 500+ GH/s!!Clock speed is 400MHz to 800 MHz producing speeds ranging from 200-500 GH per device.