Basement Watchdog computer operated AC/DC sump pump system. The Big Dog is the top of the line battery backup sump pump system. If you are looking for the best protection this is the product for you! Model: BWD12-120C. Pumps 2200 GPH @ 10-ft lift to empty the sump pit in seconds (3500 GPH @ 0-ft lift). Computer-operated controller monitors the battery, and power conditions. It also runs the pump once per week to ensure operation when you need it. Indicator lights let you know the percentage of charge remaining in battery. Powerful 20-amp charger recharges the battery quickly and shuts off completely to prolong the life of the battery. User-friendly controller sounds an alarm, illuminates a warning light, and describes what to do for easy maintenance. Runs without discharging the battery when the power is on. It is possible to double the run time of the Big Dog by hooking up two batteries in parallel (to order the necessary cables, call the service department at 1-800-991-0466, option 3). Monitors battery, power and pump activity and sounds an alarm when it detects the following situations: The battery fluid level is low (add water to the battery), The battery is discharged or defective (recharge or replace the battery), The AC power was interrupted (check the circuit breaker & connections), Pump failure (check backup pump), The pump was activated (check the main pump for failure), Battery is hooked-up in reverse. Includes a dual float switch for added redundancy and protection. Float switch only needs to move 1/4" to activate the pump. Requires the Basement Watchdog 7.5 Hour Standby Deep Cycle Battery to operate up to 7.5 hours continuously. (Sold separately). 2 Year Warranty. Extended Warranty Available. Totally submersible. Double insulated motor. Automatically switches to battery (dc) power when electricity fails. Begins pumping when water volume exceeds main pump capacity. Recharges with 20A charger (included). Daily test mode runs the pump. Tests the battery and displays the number of battery hours available to pump. Pumps 2200 gallons per hour to 10' lift. Pumps on AC to assist main pump. Battery not included. Can be used with optional remote alarm (model: bwd-ra, Item: 364452). Use model: 30hdc140d (item: 364494) 7-1/2 hour run time deep cycle battery.