content: I bought this as a desktop PC backup.A year after installing it, power went off one day when I was at my PC. I thought I would have at least 10 minutes of backup based on my PC and monitor wattage, but the UPS gave out in about two minutes, before I had finished up and shut down. Useless.Then, 4 months after the warranty expired, the beeper sounded constantly, and the power led flashed, indicating the battery was in need of replacement.The bottom line - Spent $70 for a UPS that never did its job the one time I needed it and failed just after two years. No more APC UPS for me...