The APC Back UPS Pro provides battery backup power that allows you to work through short and medium length power outages. A distinguishing feature of the Back-UPS Pro is automatic voltage regulation (AVR). AVR instantly adjusts both low and high voltages to safe levels, so you can work indefinitely during brownouts.
Site wiring fault indicator Immediately warns you of wiring problems like improper grounds that could cause shocks or prevent the UPS from adequately suppressing surges.