I'm not at home so I can't look right now, but I think I've also got the SmartUPS from APC but Butch's are a little bit bigger than mine. When I finally upgrade my 1050 to separates and get a display I'm worried about enough to put it on the UPS, I'll definitely have to add another to my system. But Butch is right, these units do protect against over/under voltage and surges.