*Requires External battery *The Centurion RT features true online double conversion. As our highest single phase power density UPS, this sophisticated range will provide the most comprehensive protection for mission critical devices such as sensitive networks, computers, servers, telecom applications, as well as industrial applications.Features: True Online Double Conversion Wide input voltage range (110-300 VAC) Input power factor correction 0.98 50Hz/60Hz frequency converter mode Programmable power outlets Emergency power off function (EPO) Eco-mode operation for energy saving (ECO) Generator compatible Backup time for all models is easily extended by simplyplugging additional battery banks Charger capacity expansion to 8A for long-run models USB+RS232 + SNMP + AS400 multiple communications Maintenance Bypass Switch available for all models N+X parallel redundancy available for 6K/10K models Hot swappable batteries 2 Year WarrantyMultiple communications available:Smart RS232USBPSSNMP (Optional)PSAS400 (Optional)PSEMD (Optional)PSModbus(Optional