The Wyze Leak detector has 2 metal contacts on the bottom and the probe has te same but on the end of the wire. You will be alerted if the probe senses a leak or if the base detects a leak,
A leak is detected when water or a conductive fluid seaps under the probe or detector and completes the circuit. When this happens, you will be notified so you can turn the water off. I believe Wyze is working on a mechanism to turn the house water off if a leak is detected. but for now, you will be alerted.