APC's Back-UPS 650 provides enough battery backup power to allow you to work through short length power outages. It also safeguards your equipment against damaging surges and spikes that travel along utility and phone lines. Specifically designed for areas with rugged power conditions, the Back-UPS 650 features Automatic Voltage Regulation AVR), which instantly adjusts high and low voltages to safe levels for your electronics, so you can work indefinitely during brownouts and overvoltages. Coupled with all the other standard features of the Back-UPS series, the 650 is the perfect unit to protect your productivity from the constant threat of bad power and lost data.