OPTI-UPS ES800C Enhanced Series 6-Outlet Line Interactive Uninterruptible Power Supply (480W, 800VA) 800 VA / 480 Watts UPS Battery Backup System, Uninterruptible Power Supply (UPS) 3 Year Limited Warranty / Live US Support, Free OPTI-SAFE Sentinel software, Simulated Sinewave Design, USB Communication Port Line interactive - corrects voltage without using battery power Surge energy rating: 1050 joules - to prevent damage from power surges or spikes, Internet/LAN (RJ11/RJ45) surge protection AVR (automatic voltage regulator), 4 hours battery recharge time, Transfer time 4 ms 6 NEMA 5-15 Outlets, (3 battery backup, 3 surge protected) LED display- Shows UPS operating status 6 minutes of battery backup at half load, and 2 minutes at full load