IVIEW 4 Bays 3.5-Inch SATA to USB 3.0 & eSATA External Hard Drive Enclosure with Fan (HF2-SU3) Main Chipset: RAID JMB391, USB 3.0 JMS539 USB connectivity: Operates at Super(5Gbps) or High (480Mbps) or Full (12Mbps) speeds Cooling feature: Aluminum case and cooling fan SATA to USB 3.0, backward compatible to USB2.0 and USB 1.1 Port multiplier to enhance one e-SATA connector, chain 4 SATA hard drives