Line-Interactive Digital UPS System offers voltage regulation, surge suppression and long-lasting battery support for personal computers, network workstations, home entertainment systems and media centers. Automatic Voltage Regulation (AVR) circuits regulate brownouts and overvoltages back to usable 120V levels without using battery power. Dataline surge suppression protects standard dialup/DSL and Ethernet connections. Built-in USB and DB9 serial ports enables optional unattended system shutdown without data loss in case of extended power failure. Built-in audible alarm and large LCD front panel voltage display indicates line power status, battery power status, battery low/replace status and voltage boost operation. Versatile design supports upright tower, flat shelfmount or 2U rackmount installation.