Wetpads™ are credit-card-sized sensors that can be placed in vulnerable places around the building that are liable to have leaks, e.g. by washing machines, dishwashers and any sinks. You can have multiple Wetpads™ in a property.
The Wetpads™ connect to the Water Control Switch by a small cable which hard-wired into a terminal block on the PCB.
If the Wetpad™ gets wet or even damp, it will set off a bleeper inside the Water Control Switch and will shut off the water supply.
These are all safe no voltage wiring.
Wireless Wetpads™ are available for easier installation.