The Smartmi is an ultrasonic humidifier with a large fog volume and fine fog particles. Water is added at the top. The highest water level can be observed on the top cover, and the spray can be returned to the water tank. The inner surface of fog passage is frosted to avoid condensing water. Most ultrasound humidifiers on the market are not beautiful in appearance but this sleek and compact device has a modern aesthetic more typical of high-end electronics.