Line-interactive digital ups system offers voltage regulation, surge suppression and battery support forputers, network workstations and more. Internal ups circuits support entry-level pcs for 60 minutes or individual vcr/dvr for 3 hours during power failure. Avr circuits regulate brownouts as low as 89 volts back to usable levels without using battery power. Includes 4 battery-supported outlets, plus 4 surge suppression-only outlets. Usb port enables optional unattended system shutdown without data loss; cable included. Pliant usb interface enables integration with built-in power management and auto shutdown of windows, mac os x and linux. Built-in single-line rj-11 phone suppression jacks protect modem and satellite receiver with standard dialup/dsl phone connection. 2.2 ghz coaxial jacks protect against surges on catv, satellite or broadcast antenna connections. 3 minute battery runtime with full load of 1000va/500w and 10 minutes with half load of 500va/250w.