Tripp Lite's 1000 VA SmartPro Digital UPS offers voltage regulation, surge suppression and long lasting battery support for personal computers, network workstations, home entertainment systems and media centers. Internal UPS circuits support entry level PCs for up to 60 minutes or individual VCR/DVR component for as long as 3 hours during power failures. HID compliant USB port enables full integration with built-in power management and auto shutdown features of Windows, Linux and Mac OSX PowerAlert software available via free download from directly from Tripplite website Single line phone suppression protects standard dialup/DSL phone connection Audible alarm and front panel LCD display offers complete UPS and line power status information, including input voltage 1000VA / 500 watt power handling ability supports a variety of sensitive computer, home-theater and other equipment 4 minutes full load runtime (1000VA / 500 watts), 14 minutes half load runtime (500VA / 250 watts) Cabinet adapts to tower format or rackmount shelf format. Rackmount (2U) format requires an optional shelf, available separately 2 year product warranty / $200,000 connected equipment Insurance (USA & Canada Only)