[aquamanic]

The float switches are just normal "dry" contact switches. They complete a circuit when closed and break the circuit when open. There's no voltage flowing through those wires - the system just detects continuity (or the lack of).

Because of this you can use not only float switches but a doorbell, magnetic window/door alarm switches, water sensors that are dry contact...just about anything that's normally open or closed (NO/NC). There's lots of applications for these type switches and they all will work on the controller.