Tripp Lites Line-Interactive UPS System offers network-grade voltage regulation, surge suppression and long-lasting battery support, ideal for network equipment, phone systems, desktop PCs and home entertainment systems. Uninterruptible Power Supply / UPS system provides battery derived AC output to maintain continuous operation of connected equipment without data-loss during power failures and severe voltage fluctuations. Runtime is expandable with one additional BP24V15RT2U external battery pack. Interactive LCD display offers detailed site voltage and UPS status information, plus a variety of UPS control options. High 97% efficient line power mode operation offers reduced UPS energy consumption and BTU heat output. Automatic Voltage Regulation / AVR circuits boost brownouts and reduce overvoltages from 75V to 147V to safe 120V nominal levels without using battery power. Included mounting accessories enable 2U horizontal rackmount installation in 2 and 4 post racks or upright tower installation. Built-in USB and DB9 serial port enables optional unattended system shutdown in case of extended power failure using PowerAlert UPS management software. HID-compliant USB interface enables integration with built-in power management and auto shutdown features of Windows and Mac OS X. Built-in data line surge suppression jacks offer protection for equipment with single-line dialup, DSL or network Ethernet connection.