ICY DOCK MB561S-4S Serial ATA 3.5-Inch Multi-Bay eSATA Hard Drive Enclosure Four-bay external hard drive enclosure accommodates up to four SATA I/II hard drives and has an eSATA interface eSATA for up to 3 GBps transfer rates Replaceable ball-bearing fan provides cooling Made of aluminum with a shock-absorbing design Device measures 5.6 x 6.9 x 9.2 inches (WxHxD)