Tripp Lite INTERNETOFFICE500 500VA 280W UPS Desktop Battery Back Up Tower 120V USB RJ45 PC, 6 Outlets 550VA/280W tower 120V standby UPS 3 UPS battery supported outlets, 3 surge-only outlets USB port, TEL/DSL/ethernet protection NEMA 5-15P input plug and 6 NEMA 5-15R outlets Supports entry level PC systems for up to 30 min. during brownouts and power failures, enabling safe system shutdown