Ultrasonic Aroma Technology Cold Diffusion that locks in the properties of Essential Oils Perfect for Diffusing Tisserand Essential Oils Create a delicate and fragrant atmosphere to suit your every mood with our Aroma Spa Diffuser.This modern aromatherapy diffuser combines an elegant lightweight design with all the benefits of ultrasonic aroma technology for a fine and silent mist that envelops a room. The Tisserand Aroma Spa Diffuser also combines the benefits of aromatherapy with chromatherapy through gentle variations of soft coloured light.