Our Goldshell test fixture is carefully put together with the control board, pre-installed test firmware, power cord, hash board cable, and a fan simulator. It is utilized to identify issues with the CK5 HS5 LT5 miner hash board. If you would like to purchase this item, we would be more than happy to provide you with our services including technical support and other methods. Additionally, all our products undergo a vigorous test before shipment to guarantee it is in proper working order.