12-volt standby sump pump system that takes over automatically when power fails. Tethered switch. Alarm system indicates when power has failed. Works with most brands of pedestal and submersible sump pumps. Built-in check valve. Works off standard automotive or marine battery (not included). Includes battery charger and battery case. Performance: discharge head, gallons/hour at 0’ is 1750, 4’ 1512, 8’ 948, 10’ 720.