Great used condition.  Memory upgraded to 1GB.  Fully functional, see attached for recent screen shots of the device health.

Includes:

ReadyNAS Duo (RND2120-100NAS)

Original Netgear Power Supply

2 X 2TB Seagate Barracuda Harddrives (no issues in SMART data, see attached)

From the manufacturer:

The ReadyNAS Duo Network Hard Drive from Netgear is a high-capacity network hard drive. It features a Gigabit Ethernet interface, remote file access over the Internet, UPnP AV streaming, and an integrated BitTorrent client. The drive supports Windows, Mac, Linux, and UNIX clients, making it an excellent option for small business networks.

Gigabit Ethernet Interface
The Gigabit Ethernet interface allows users to access data and administrators to administer the drive remotely through a standard LAN connection, making it easy to add to your existing network infrastructure.
RAID 1 Capability
As configured, the enclosure ships with a single physical hard drive. It has an unoccupied drive bay, into which you can install a 3.5" SATA drive of identical capacity. Doing so creates a RAID 1 system, which writes data simultaneously to both physical drives in real time. This creates a realtime backup of your data, ensuring that no data will be lost in the event of a single drive failure.
USB Storage Expansion and Printing
The ReadyNAS Duo features three USB 2.0 ports for expansion. You can connect any USB mass storage device, including digital cameras, external hard drives, flash drives, and memory cards, to these ports to make their data accessible over your network. You can also use the ports to turn the ReadyNAS into a USB print server, or to connect it to a monitoring port of an Uninterruptible Power Supply.
Remote File Access
When connected to an Internet router, the ReadyNAS Duo can be configured to share files via the web. It features security features so that only you will be able to access your data.
UPnP Streaming
The device is complaint with the UPnP standard for media streaming. This allows network UPnP devices to access movies, photos, and music stored on the ReadyNAS. Examples of UPnP devices include the Netgear EVA8000, Sonos Digital Music System, Logitech Squeezebox, Sony Playstation 3, and Microsoft Xbox 360.
BitTorrent Client
The ReadyNAS Duo features an embedded BitTorrent client. This allows you to download files via the BitTorrent protocol, without having to leave your computer on constantly.