The Wayne primary pumps operate using a vertical float switch that will activate the pump and shut it off at a set level. There are no other options that I am aware of. The battery backup systems will also use a vertical float switch but do incorporate a timing system into their operation as a safety and this may be the source of your confusion. The control box has a time delay which keeps the pump from repeated, short cycles when it shuts off. This time delay feature will allow the pump to run 20-25 seconds after the switch reaches the off position.