These outlets provide backup power to the connected equipment during power outages. The BackUPS must be turned ON in order to supply backup power. These outlets also provide protection to the connected equipment from power surges or spikes, even if the Back-UPS is turned OFF. Connect a computer, monitor, modem or other critical devices you want to stay powered during outages or utility problems into these outlets. This Back-UPS unit has Automatic Voltage Regulation (AVR). If the input utility voltage drops below a level that is safe for the operation of the connected equipment, the unit will boost utility voltage up to safe level. It will also compensate for high input utility voltage by lowering it to a level that is safe for the connected equipment.