APC's slimline rack-mount Smart-UPS deliver premium uninterruptible power and the most advanced performance features available. With PowerChute Plus software the uninterruptible power supply (UPS) will safely store data and shut down your network operating system before the battery is fully discharged, whether you're there or not. The SmartSlot internal accessory slot allows you to install optional accessories to enhance the performance of your UPS. APC Smart-UPS RM is the perfect UPS for rackmountable fileservers, minicomputers, UNIX CPU's, Internet hubs, telecommunications systems and other mission-critical applications.