OPTI-UPS ES1500C Enhanced Series 8-Outlet Line Interactive Uninterruptible Power Supply (980W, 1400VA) UPS Battery Backup (RS232 Port) 1400VA / 980W UPS Battery Backup System, Uninterruptible Power Supply (UPS) 3 Year Limited Warranty / Live US Support, Free OPTI-SAFE Sentinel software, Simulated Sinewave Design, Uninterruptible Power Supply (UPS) Line interactive  corrects voltage without using battery power, Connectivity - interface Port DB-9 RS-232, (USB optional) 1050 joules surge energy rating to prevent damage from power surges or spikes, Internet/LAN (RJ11/RJ45) surge protection AVR (automatic voltage regulator), 8 battery backup outlets, Easy battery replacement procedure, 4 hours battery recharge time Smart power management software (included), Transfer time 4 ms, LED display- Shows UPS operating status Advance Warning-Front Panel: AC Mode/Buck/Boost/Battery Mode/ Battery Fault History record of power failure events, Scheduled shutdown & reboot, Extended battery run time  2 internal batteries