APC Smart-UPS RT, 4200 Watts / 6000 VA,Input 230V / Output 230V, Interface Port DB-9 RS-232, RJ-45 10/100 Base-T, Smart-Slot, Extended runtime model, Rack Height 3 U with Web Card and PowerChute Network Shutdown. Typical Backup Time at Half Load 15.8 minutes (2100 Watts) Typical Backup Time at Full Load 5.3 minutes (4200 Watts)