Key Features AVR550U 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 Maintains battery-derived AC output during blackouts and severe voltage fluctuations with up to 17 minutes runtime for a basic desktop PC 8 built-in NEMA 5-15R outlets, two with extra wide spacing to accommodate transformer plugs without blocking outlets 4 outlets with battery backup and surge suppression protect critical equipment, plus 4 additional surge suppression-only outlets protect less critical devices not requiring battery support 4 battery supported outlets protect computer, monitor and vital system peripherals, plus 4 additional surge suppression-only outlets for printers and other system accessories not requiring battery support 550VA/300 watt power handling ability supports a variety of PCs, workstations, point of sale equipment and other sensitive electronics Built-in data line surge suppression protects a single dialup or DSL line DB9 serial port with included cable and PowerAlert UPS monitoring software (available via free download from www.tripplite.com) offers safe unattended shutdown without data loss during extended outages Supports Tripp Lite's Watchdog system service to restore operation to locked equipment through soft reboot of application/OS or hard power off/on reboot of connected equipment - ideal for unattended kiosk applications Built-in grounding lug offers convenient grounding point in for dataline suppressors and other equipment Hot swappable user battery replacement supported via battery access door Space saving, ultra-compact housing fits almost anywhere Keyhole mounting flanges enable secure wallmount installation Package Includes AVR550SER UPS System Serial cable, Phone cable Instruction manual