the water leak sensor adopts the advanced wireless transmission technology; the sensor will alarm immediately and send a wireless signal to the receing host,when the water level indicator exceeds the inmmersion probe foot,it will remind you to do the next step automaticallyPurchase:https://www.aliexpress.com/item/Free-...VK:https://vk.com/join?ah=qpSvAnkXs8Facebook? 1/4 ?https://www.facebook.com/KERUI-527572...Our website? 1/4 ?http://www.secruimall.com/