ToughTech Duo QR boasts a passive thermal design for optimal heat dissipation, which requires no fans thus making Duo ultra quiet. Duo has front-accessible lockable trays, an intelligent LCD menu system, Kensington lock, host connection LEDs, and a vertical stand. It connects to any host computer via USB 2.0, and eSATA using an extremely fast chipset. CRU ToughTech Duo 36020-2510-0100 DAS Array is one of many NAS (Network-Attached Storage) available through Office Depot. Made by CRU.