Turn four SATA drives into an external storage device with USB (Universal Serial Bus) 2.0 & e SATA connectivity Support for up to 4 drives provide large amounts of storage with a choice of high speed interfaces from USB (Universal Serial Bus) 2.0 or e SATA The removable front cover & accessible drive bays allows drives to be replaced easily in case of failure or upgraded An 80mm controllable cooling fan & aluminum chassis help to keep drives from overheating Star Tech.com''s SAT3540U2E Multi Bay External Hard Drive Enclosure is a high-performance 4-drive SATA enclosure connected to host systems through e SATA and/or USB (Universal Serial Bus). The enclosure can be connected to two systems simultaneously, one through USB (Universal Serial Bus) & one through e SATA, allowing users to share installed SATA hard drives between the computers by switching host connections back & forth at the touch of a button. The 4-drive SATA enclosure works with high capacity (tested with up to 4TB per bay) 3.5in Serial ATA hard drives (SATA, SATA II, SATA III) & features a removable front cover that ensures easy access while installing or removing the drives. WhatÂ’s in the box Four drive HDD enclosure USB (Universal Serial Bus) Cable e SATA Cable Screw driver & screw kit Power Cords (NA/UK/EU) Universal Power Adapter) Manual