TRIPP LITE's AVR550U AVR series line-interactive UPS system offers 550 VA ultra-compact line-interactive protection for PCs and workstations. System maintains 120 V nominal output over an input range of 83 – 147 V. Workstation-optimized features include USB port (HID-PDC compliant), single-line telephone/DSL surge suppression, space-saving right-angle input plug, four battery / surge-protected outlets and four additional surge-only outlets (8 total). USB port (included cable) works with free unattended shutdown software. Housing is mountable.