Liebert PSA is a line-interactive UPS that provides up to five minutes of back-up time at full load -- more than enough time to save work in progress & shut down the connected equipment. USB (Universal Serial Bus) shutdown software & a USB (Universal Serial Bus) cable are also included. The UPS offers three or six battery-backed outlets, & one or two surge-only outlets. The UPS is available in 500VA, 650VA, 1000VA & 1500VA sizes, 120V & 230V models. Flexibility: Available in four sizes, including 500, 650, 1000 & 1500VA ; 120VAC or 230VAC. Three or six battery-backed UPS outlets, depending on model size. One to two surge-only outlets, differentiated by color. USB (Universal Serial Bus) communications/shutdown software & cable included. User replaceable batteries. Higher Availability: Up to five minutes of battery backup time at full load. Full sequenced battery testing to ensure batteries are available when needed. Advance early warning of UPS shutdown. Lightning & surge protection (TVSS). RJ-45 port for data line surge protection. Site wiring fault indicator. Lowest Total Cost Of Ownership: Two-Year replacement warranty. Optional one year or three warranty extensions. Ideally Suited For: Professional desktop PCs Professional workstations Small routers, bridges & hubs Point-of-sale terminals Other sensitive electronics