Tripp Lite AVR550U AVR Series Line Interactive UPS 550VA, 120V, USB, RJ11, 8 OutletBuilt-in Automatic Voltage Regulation boosts brownouts and reduces over-voltages back to 120V levels. Provides battery-derived AC output during blackouts for maximum peace of mind. Single phone line suppression protects modem, fax and other accessories. USB port works with free unattended shutdown software. Protection Type: DSL; Fax; Modem; Phone; Power; System VA: 550 VA; Backup Time at Half Load: 9 minutes @ 150 Watts; Lines: 1.