Series: SmartPro Output Voltage: 120V Outlets: 8 Outlet Type: 4 NEMA 5-15R and 4 NEMA 5-15/20R Battery Run Time: Full load runtime 11 minutes (1900w) Half load runtime 28 minutes (950w) Battery Recharge Time: 3.6 hours from 10% to 90% (internal batteries) Alarms: 3 function audible alarm indicates power failure conditions (4 short beeps every 10 seconds), overload (continuous short beeps) and low battery (continuous tone) Interface Port: RS-232, USB