OPTI-UPS ES1000C Enhanced Series 8-Outlet Line Interactive Uninterruptible Power Supply (700W, 1000VA) UPS Battery Backup (RS232 Port) 2 Internal Batteries Powerful On-Board AVR (Automatic Voltage Regulator) to regulate/correct AC input voltage 1050 Joules Surge Energy Rating; RJ11 & RJ45 Protection 4 Hours Battery Recharge Time & Easy Battery Replacement Procedure Clear LED Status Indicator & Audible Alarm Self-Diagnostic & Smart Power Management Software 8-outlet line interactive uninterruptible power supply Maximum capacity: 1000VA, 700 Watts 8 NEMA 5-15R battery backup outlets Surge energy rating: 1050 Joules 10 minutes of battery backup at half load, and 3 minutes at full load