Intelligent Working Mode - Equipped with a light sensor and a water volume indicator, the water fountain can automatically adjust the frequency of water flow between day and night when operating in Smart Mode, a quieter and energy-saving mode. In Normal Mode, the water flows continuously to ensure that your pets always have access to water, especially after intense activity. The low water level alarm and automatic shut-off provide additional safety. A filter replacement notification is displayed to remind you to change the filters. The ultra-silent system with its noiselessly designed pump and unique, winding water flow ensures a special and calm experience for pet owners.