Sensor Working Theorem: the sensor working theorem is according water conductivity. Work process is as follows:
When the sensor is thrown to water, once the two pins touching water,the sensor will begin working.
When the sensor is dropped out from the water, you can dry the remained water from pin surface,the sensor will stop working
The sonar sensor store
Do not place the sonar sensor in a wet area when not using,the dampness may cause the sensor to turn on itself automatically.The battery will be depleted fast. Otherwise, avoid placing it on a metal board!
You should store it in a dry, nonmetal place! The place is far away from any metal equipment.
Clean the surface with fresh water after use. Dry it before store it.