Create the perfect atmosphere with the Levoit Smart Hybrid Ultrasonic Humidifier, which can help ease congestion with warm or cool mist. Choose between 3 mist levels to suit your room size and control setting with the free VeSync app. For hands-free control, connect to a third-party voice assistant through your VeSync account. Sleep Mode automatically adjusts the mist levels for you based on detected humidity levels and turns off display lights, so you can sleep soundly. If you enjoy essential oil fragrances, add a few drops into the aroma box for lightly scented mist.