ses water, the water quantity acquisition device starts to collect the water consumption, and converts the needed electronic signal to the microcomputer module for metering, and displays it on the LCD display module. When the amount of water used by the user drops to a certain value, the microcomputer module gives a sound alarm and prompts the user to pay a fee to buy water with the card. If the amount of water is exceeded, the microcomputer module automatically closes the electronic control val