APC Back-UPS Pro Emergency power supply Automatic voltage adjustment (AVR) with low voltage correction function Increases battery life and prolongs maintenance time thanks to low voltage correction without discharge of the battery. Overvoltage protection of an anological telephone line Provides protection of connected equipment against overvoltages on data transmission lines. Non-supported sockets (overvoltage protection only) Protection of additional electronic equipment from overvoltages and voltage surges without energy consumption from batteries sustaining the power supply of key equipment in the event of power outage. Smart battery management Maximise battery performance, operating time and reliability by intelligent precision charging. Configurable voltage switching points Switching voltages (expand or narrow down the allowed voltage range) can be selected where UPS switch to battery power, allowing maximum maintenance time to be extended and the sensitive electronic systems to be effectively protected. Output sockets with battery support and socket with overvoltage protection only Power supply and ability to operate connected devices that require backup battery power supply and protection against shocks for less important devices.