Great price for a 550VA UPS. UPS = Uninteruptible Power Supply and it does just that. It allows for a continuous source of electricity in case there's ever an outage on your block. This buys you time to safely save your work and power down. It features 4 battery backup outlets with surge protection and 2 surge only outlets. With a capacity of 330 watts this unit is geared towards entry level computers and home electronics. The Office Series 550VA UPS features easy to replace batteries for extended product life. BELKIN UPS BATTERY BACKUP W/ SURGE PROTECTION SALE