The CyberPower Systems CP900D / CP900AVR / BC900D is the ideal unit for mid-level to upper level computer systems. With battery run times up to 105 minutes, this unit really performs. The CP900D / CP900AVR / BC900D not only guards against surges, spikes, sags, brownouts and other power abnormalities, but also protects your computer system and valuable data during a power outage. The automatic voltage regulation (AVR) will step up low voltages to safe output levels without resorting to battery power. PowerPanel Personal Edition Software is included with each model. In the event of a power outage, PowerPanel Personal Edition Software automatically saves and closes open files and then shuts down the computer system in an intelligent and orderly manner.