I'm selling an unopened APS UPS system. These are useful during a power interruption as they will keep your electronics running off battery until power is restored. Brand new in the box, the following link will give more detail: http://www.amazon.com/APC-BACK-UPS-BE750G-10-Outlet-System/dp/B000Z80ICM They retail for 80$, but I'm willing to sell it for 50$ or best offer. thanks!