The Liebert® PSA is a compact line-interactive UPS that offers cost-effective, full featured power protection for small office computers and electronic equipment Designed with simple controls for easy operation, the Liebert PSA provides up to five minutes of back-up time at full load... more than enough time to save work in process and shut down your system. Shutdown software and a USB cable are also included, to allow remote alerts and automated graceful shutdown of the connected systems.