Tisserand Aromatherapy Aroma Spa Diffuser Tisserand Aromatherapy Aroma Spa Diffuser Combining a lightweight and elegant design with the benefits of ultrasonic aroma technology, the Tisserand Aroma Spa Diffuser creates a delicate and fragrant mist that envelops the room. Vibrating water molecules at a specific frequency which switched on, the diffuser produces steam with tiny bubbles via heated water. By heating your chosen essential oil in the water reservoir, the steam rises and bubbles break to form a fine vapour. Chromatherapy also comes into play, with gentle variations of soft coloured light. *Please note Tisserand are in the process of updating their packaging to new and improved designs. Please be aware that imagery on site may differ to what you receive.