Tripp Lite AVR550SER 550VA AVR UPS TEL/DSL 120V 5-15R 8 Outlet (Black) (Discontinued by Manufacturer) AVR550SER ultra-compact 120V line interactive UPS offers complete protection from blackouts, brownouts and surges Built-in Automatic Voltage Regulation (AVR) corrects brownouts and overvoltages from 83 to 147V back to usable 120V nominal levels without using battery power Built-in NEMA 5-15R outlets, two with extra wide spacing to accommodate transformer plugs without blocking outlets Maintains battery-derived AC output during blackouts and severe voltage fluctuations with up to 17 minutes runtime for a basic desktop PC 3 year warranty and $100,000 Ultimate Lifetime Insurance for connected equipment insurance