If the power should go out, keep your critical devices powered, including your internet connection, so that you might avoid the loss of valuable data and safely shut down your equipment. Audible alarms ensure you're promptly alerted when power sources lapse. Self-testing battery and adjustable voltage sensitivity deliver optimal performance in all environments. All nine outlets provide surge, lightning and circuit-overload protection for attached devices. Intelligent battery management system supplies power as soon as electrical service is interrupted. The LED status display indicates On Line, On Battery and Building Wiring Fault conditions. USB port provides charging convenience. Three wide-spaced outlets permit the use of transformer-based plugs.