In the Z-Wave network communications, water sensor can work with any Z-Wave main controller. In the Z-Wave network communications, water sensor can send messages to the Z-Wave main controller, and realize association with other devices through the Z-Wave network. In the communication with the Z-Wave main controller, the water sensor can send messages to the Z-Wave main controller, but it can not receive messages from the Z-Wave main controller. When the water sensor is triggered, the LED light keeps on and the buzzer will make sound. The water sensor sends messages to the Z-Wave main controller at the same time, the Z-Wave main controller will display the current status of water sensor. Water sensor is battery powered, is small and can be installed easily.