For securing inlets and outlets as well as overflows, e.g. on bathtubs, washing machines, boilers, water storage tanks, etc. or rooms at risk of flooding. The non-oxide probe sensor technology ensures a long service life of the device, where both radio and sensor module can be mounted on the wall. When the battery level is low, a warning is sent to the base unit. The cable between the radio module and the sensor has a length of approx. 30 cm.