The CyberPower Systems CP550SL is the ideal unit for mid-level computer systems. With battery run times up to 60 minutes, this unit really performs. The CP550SL 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. 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.