Selling my Ion Sump pro model 75 Battery backup power supply for a sump pump. This Uses two deep cycle batteries and it has a built-in charger and power inverter that will convert the battery power to 120 V AC power during a power outage and will power your existing sump pump at all times. It will automatically switch to battery backup when the power goes out and you do not need to do anything. Tested and works perfect it is for the unit. Only you do need to buy two deep Cycle batteries for the unit selling because I bought a whole house generator.