Smart Humidifier: Easy voice control via Alexa or Google Home devices; Smartphone control via Sun Home app Large Capacity: 4L / 1. 06 gallon allows up to 30hrs use without refilling (suitable for room size of 10-30 m² / 107-322 ft²) Super Quiet Operation: Ultrasonic technology, less than 36dB working noise. Unique designed sleep mode, silent and with no light disturbance Multi-Functions: Preset humidity, timer function, memory function, low water warning and night light mode User Friendly Designs: Regulate direction with a 360° nozzle; 3 mist levels; humidistat; water filter; LED screen; handy refilling handles