Herbal Select PureMist Ultrasonic EO DiffuserProviding stylish design, pleasing aromas, and cool, humidifying mist to create the perfect environment for your home or office. Ultrasonic diffusers rely on high frequency sound waves to break down water particles and create an ambient mist that is so fine that it can appear as a fog. This ultrasonic diffuser blends contemporary design and the latest in ultrasonic technology to effectively disperse a cool, humidifying vapour. Simply add one cup (250