The SereneLife Warm & Cool Mist Ultrasonic Humidifier effectively increases room humidity levels. The moisture & energy efficient design makes it perfect for any room in the home or office. This system allows you to create more comfortable & breathable air, for any indoor environment. The clean and minimalistic style features simple button control operation, rotary knob for adjustable water vapor flow -- and with the press of a button, you can go from warm to cool mist vapor. The water tank is easily refillable and runs of regular tap water from the kitchen sink. Eliminate uncomfortable 'dry' air & breathe easy with the SereneLife Ultrasonic Warm & Cool Mist Humidifier.