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, pow