USB 3.0, Mounting possibilities: 3x 5.25 drive bays (external) or 2x 5.25 drive bays + 1x 3.5 bay (external) + 3x 3.5 hard drive bays (internal) + 4x 2.5 SSDs/HDDs (internal), Front I/O: 2x USB 3.0 (internal 19-pin mainboard connector incl. USB 2.0 plug), two USB 2.0 as well as two audio plugs - NO PSU, Retail Box , 1 Year warranty