This 4L large capacity aroma humidifier utilizes advanced ultrasonic atomization technology to produce fine and even mist, quickly increasing indoor humidity levels Dual mode design with mechanical and smart options caters to different user needs, smart mode automatically detects environmental humidity and adjusts mist output for optimal comfort Ultra-quiet operation ensures no disturbance during nighttime use, making it perfect for bedrooms, offices, and other spaces requiring quiet environments Top filling design makes water refilling exceptionally easy, no need to move the unit or turn it over, solving the inconvenience of traditional humidifier refilling Built-in professional aroma box supports adding various essential oils, releasing pleasant fragrances while humidifying, effectively purifying air and improving indoor air quality Suitable for multiple scenarios including homes, offices, and bedrooms, helps alleviate discomfort caused by dryness, bringing fresh and comfortable air environment to your space