Originally purchased for over $1,000, this USP is only a couple of years old, works great, and should still be under warranty if/when registered with the manufacturer.
Comes in the original box with all of the original documentation and components.

Technical Description
Brand: Tripp Lite
Model: SMART750RM1UN
Input Connector Type: Power NEMA 5-15
Output Connector Type: Power NEMA 5-15
Power Output Connectors Details: 6 x power NEMA 5-15 (UPS and Surge)
Interface Provided: 1 x EPO (emergency power off), 1 x management (RS-232) - 9 pin D-Sub (DB-9), 1 x management (USB) - 4 pin USB Type B
Power Capacity: 750 VA
Power Provided: 600 Watt
Provided Voltage: AC 120 volt
Frequency Provided: 60 hertz
Battery Run Time (Up To): 4.9 minute (time unit)
Battery Voltage: 24 volt
Rack Height: 1U
Output Voltage: 208 - 230 V AC
Protocols: Web, SNMP, Telnet
Form Factor: Rack Mountable
Height: 1.8"
Width: 17.9"
Depth: 16.5"