Mediasonic HF2-SU3S2 3.5 Black SATA I/II/III USB 3.0 & eSATA 4 Bay External Enclosure AC Adapter: Yes Dimensions: 6.53 x 4.96 x 8.47 Fan: Yes Specifications: Supporting OS: Windows 2000 / XP / VISTA / Windows 7, Mac OS 10.3 or later Power Adapter: 100V to 240V Safety Specification: CE / FCC / Rohs Maximum Capacity (per Bay): Up to 8TB Weight: 3.97lbs. (excluding hard drive)