Working status is UNKNOWN. It failed one day and we're unable to determine the root cause. It comes with a power "brick".

3.5in 4 Drive eSATA USB FireWire External SATA RAID Enclosure

High-Speed USB 2.0 host interface, with transfer rates up to 480Mbps
SATA revision 2 compliant eSATA host interface with transfer rates up to 3.0Gbps
FireWire 400 and 800 host interfaces with transfer rates up to 400Mbps and 800Mbps respectively
Supported RAID modes: 0 (stripe), 1 (mirror), 3 (parity disk), 5 (striped parity), 10 (1+0), Span/Concatenation
User configurable directly from the unit itself
Removable front cover and accessible drive trays
80mm cooling fan with 4 selectable speeds: Low, Med, High, Auto
Auto power saving when the host connection is disconnected or turned off
No driver or software installation
Compatible with SATA revision 1/2/3 (1.5/3.0/6.0 Gbps) drives
Supports 3.5" form factor SATA hard drives
Plug-and-Play and hot-swap compatible
Rugged aluminum chassis