This pump controller works well for simple applications. The float is well designed, and though "dual float" may lead you to believe that it comes with two separate float assemblies, it's really one assembly with two floats inside. The floats are designed for redundancy. If the lower float fails to signal the pump, you get another chance with the upper float. The key design win here is that the floats are not mechanically linked to the electrical system of the controller. The floats are actually two floating magnets resembling small doughnuts, slid onto a pole running through their centers. The floats, um, "float" freely on the pole, and two magnetic sensors embedded in the pole detect when either of the floats are in the right position to trigger the pump. This is a great design and appears to be *very* reliable. Once the pump is triggered, it runs until the float returns to just below the trigger position, then stays on for a few seconds more. This is good enough to keep a basement sump from overflowing. You could even turn the float assembly upside-down and and create a "auto filler" for use in ponds (or other applications) where the pump is triggered when the water level is too low.