ICY DOCK 4 In 3 Sata I/ii Module 4 in 3 SATA I II module Design that delivers high availability, scalability, and for maximum flexibility and price/performance Made in China 4 in 3 RAID back plane module. Fits three 3.5 SATA I/II hard drive fully supports Hot-Swap function. Compact and space saving for multiple drives fit (Four drives within three 5.25 bay fitting). Internal drive security, exchangeability, expandability and maintenance capabilities Durable aluminum body for excellent heat dissipation with stylish outlook Detachable 80mm ball bearing rear cooling fan for easy maintenance Advanced drive monitoring system built internally w/ visual & audio indicators