APC Smart-UPS 1400 Rackmount Uninterruptible Power Supply SU1400RM2U NSN: 6130DSINVERTE P/N: SU1400RMN2U

Regular price $119.99
I've tested it under load for at least 20 minutes and it appears to me that the UPS is functioning properly.
APC stopped making this model a long time ago.  This unit has been unplugged and in storage for about 5 years.