P.S. to what I said above: the Surge Master bar and the APC backup unit are plugged into the same outlet. The backup unit stays on 100% of the time and it took a fatal hit from the lightning; however, the power bar, which was turned off, was just fine. I may be in LaLa Land, but I'm of the opinion that, if the bar power is turned off, my equipment is safe during an electrical storm.