Basement Watchdog Special Battery Back Up Sump Pump System, Switches To Battery Power When AC Power Fails, Begins Pumping Immediately When Water Volume Exceeds Main Pump Capacity, Automatic Recharge, Battery Monitor, Pumps 1730 Gallons Per Hour To 10', Totally Submersible, Non-Corrosive Pump Housing, Alarm System Sounds When Battery Needs Water, Battery Is Old, Battery Is Discharged, Battery Cable Is Loose, Power Is Out, & Pump Was Activated, Battery Not Included, Order Separately Model #30hdc140S, TV #364-494, 7.5 Hour Run Time Deep Cycle Battery.