Internal UPS circuits support entry level PC systems for up to 30 minutes during power failures so that connected equipment can be shutdown without data loss. Automatic Voltage Regulation (AVR) regulates brownouts back to usable levels without using battery power. Includes USB port to enable optional unattended system shutdown without data loss in the case of extended power failure. Built-in RJ11 phone suppression jacks protect modem, fax machine, cordless phone, or other peripheral with a standard dialup/DSL phone connection. Audible alarm and 4 front panel LEDs indicate UPS system and line power status. 550VA / 300 watt power handling ability supports a variety of computer, internetworking, telecom, and consumer electronics equipment. System VA: 550 VA; Backup Time at Full Load: 550 Volts @ 4 minutes; Backup Time at Half Load: 275 Volts @ 14 minutes; Automatic Voltage Regulation (AVR): Yes.