APC SUA1000XL Smart-UPS XL 1000 VA 120 V UPS with USB and Serial Interface Uninterruptable Power Supply (UPS) to configure with up to 10 matching battery packs for runtimes exceeding 24 hours PowerChute management software included for safe system shutdown and advanced UPS management SmartSlot to install additional accessories Rackmount form factor for easy deployment Hot Swap Batteries; Intelligent Battery Management; Replace Battery Indicator; User Replaceable batteries