Hi Lorie, I have down considerable research on UPS units. I have found APC to be one of the worst UPS manufacturers available. My research has pointed me to a company called powerware. The UPS units from powerware have a longer warranty, and can guard against more types of power problems than APC UPs units. Since I work in educational, our company also benefits from a discount. There are nine types of power problems that can be covered by a UPS. I have a chart explaining these 9 types of power protection. You can get a unit that protects 3, 5, or 9. Mark ------------------------------------ Mark Budman Systems Engineer Devry College of Technology 5860 Chedworth Way Mississauga, ON L5R 3W3 mbudman@xxxxxxxxxxxx (905) 502-5193x6235 / (800) 249-5777 ------------------------------------