Will Jaya 4-Bay NAS 3.5" SATA HDD Hot-Swap Premium Mini-ITX NAS Cloud Storage Enclosure with 1 Expansion Slot and 220W 1U Flex PSU A well engineered compact NAS server enclosure for Mini-ITX MB Fabricated with premium aluminum and steel materials Solutions for Collaboration, Virtualization, and File Syncing, Sharing, and Protection Lower-power/noise green system enclosure which features a 12cm low speed case fan with automatic speed control to fit in the quiet working environment Applications servers include: File Sharing, FTP, Backup, Printer, VPN, Web, Mail, iTune