One press button helps you easily change the working modes of the humidifier. There are 2 modes to choose: Dual Spray Mode and Single Spray Mode (Left or Right). Press once and it will continuously dual spray for 8 hours, press again and it will spray one side for 12 hours. A top-filling design makes the air humidifier is easily refilled and cleaned. Simply open the top cover to add clean water directly to the water tank through the wide opening top. No need to disassemble the device to fill it with water. 800ml water tank allows for 8 to 12 hours of continuous use; You can enjoy whole night sleep, farewell to frequent adding water. Humidify the room without excess noise which creates a comfortable environment to ensure you feel well and get a nice sleep.