Please go to the Device Settings page of the MS100 and select Automation. Users can trigger other Meross smart devices based on temperature or humidity using the Smart Sensor.
Please follow below figure to open the device's housing. And then you can replace its battery easily.
When the Smart Sensor is positioned flat on the floor, approximately 1mm above the floor, it will detect a water leak once the water level exceeds this point and the probe comes into contact with the water.