DESC: APC's slim line rack-mount Smart-UPS delivers 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. SmartSlot internal accessory slot allows you to install optional accessories to enhance the performance of your UPS. Additionally, the APC NetShelter enclosure provides security, flexibility and proper management of all your rack-mount devices.