Line-Interactive Digital UPS System offers voltage regulation, surge suppression & long-lasting battery support for personal computers & more. Internal UPS circuits support entry-level PCs for up to 40 minutes or individual VCR / DVR components for as long as 2 hours during power failures. Prevents data loss, viewing interruptions & loss of programming. AVR circuits regulate brownouts as low as 89v back to usable levels without consuming battery power. Includes four battery-supported / surge-protected outlets, plus four additional surge suppression-only outlets for items not requiring battery support. USB port enables optional unattended system shutdown. Includes cable. HID-compliant USB interface enables full integration with built-in power management & auto shutdown of Windows, Mac OS X & Linux. Offers three-minute battery runtime with full load of 650VA / 350W & 12 minute with half load of 325VA / 175W.