Small in stature, but huge in performance! Even with a diminutive size, rooms of up to 250 square feet pose no challenge. This ultrasonic humidifier is made of resistant materials and equipped with an anti-calcium cartridge and Ionic Silver Cube: It will not leave the white powdery film produced by other humidifiers. Elegance and easy operation are maintained by control buttons located out of sight on the underside. Easy readability of the water level is indicated by LED indicator lights that switch from blue to red when the tank is empty.