The Back-UPS 650 8 Outlet Surge Protector and Battery Backup (120V) from APC provides backup battery power and surge protection for your devices that require outlet power, such as your computer. This Uninterruptible Power Supply (UPS) features four surge-only protected outlets and four surge and battery-protected outlets with a total output power of 390W. At half-load, or 195W, the battery can last for up to 12 minutes; at full load, or 390W, it can last for 3.3 minutes. This UPS is compatible with devices that have an input voltage of 120V and a frequency of 50/60Hz, such as those found in the United States.