The Lexar Professional Workflow XR2 Card Reader for XQD Cards is a USB (Universal Serial Bus) 3.0 reader designed for use within the Lexar Professional Workflow HR2 Hub. The compact form fits within one of the four bays of the HR2 Hub to enable its use along with up to three additional Professional Workflow Card Readers. Alternatively, this reader can be used independently of the hub as a standalone reader along with the included USB (Universal Serial Bus) cable.