Features: The built-in double-boost and single-buck AVR (Automatic Voltage Regulator) function compensates for broader range of low AC voltage situations like brownouts and sags as well as high AC voltage situations like surges and spikes saving internal battery power for blackouts and extending the life of the batteries Independent Battery BypassÖ allows the UPS to provide voltage regulation with surge and spike protection on utility AC power even when batteries are weak or dead Includes MINUTEMAN SentryIIÖ power management and diagnostic software to provide added control and allow unattended PC shutdown (for use on individual PCs or multiple workstations on networks) Integrated USB and RS232 ports for software communications (USB and RS232 cables included) 3-Year Parts and Labor Warranty