Eagle Tech ET-CSMDSU2-BK 3.5-Inch Tool-less Dual Bay SATA to USB Enclosure w/OTB & Dual Channel Controller (up to 4TB) User selectable Dual or JBOD mode. Dual mode supports 2 x 2TB (total 4TB) using OS-based or third party software-based RAID 1/0 (not included) Hot-swappable, tool-less, quick release button, one touch backup, 4cm fan, user selectable Dual or JBOD modes Fits two 3.5-Inch SATA hard drive up to 2TB and connects to USB 2.0 Enclosure measures 7.5 x 4.9 x 2.5 Inches Package contains one portable HDD enclosure, quick installation guide, one touch backup software and universal AC power adapter