Input: 220V AC Output: 3 X 220V AC Wattage: 500WMax capacity: 50VA Compact powder coated metal case Affordable high performance AVR An automatic voltage regulator is usually a feature of uninterruptible power supplies (UPS units), this allows them to lower or raise an erratic incoming voltage to the proper output voltage without relying on the batteries! How this helps your computer is possibly reducing stress on the PSU. Efficiency drops as input voltage drops, meaning more power is being wasted as heat!