Product details:

Liberty's model 441 takes over when the power goes out. Operating from the power of a marine-grade deep-cycle battery, the 441 features a high-output 12 volt pump, advanced 5-stage charging system, easy-connect terminal block, battery box and plumbing connexions. (Battery not included.) Designed to be used in conjunction with a primary 120V sump pump. Liberty's model 441 takes over when the power goes out. Operating from the power of a marine-grade deep-cycle battery, the 441 features a high-output 12 volt pump, advanced 5-stage charging system, easy-connect terminal block, battery box and plumbing connexions. (Battery not included.) Designed to be used in conjunction with a primary 120V sump pump.