Mist-de-light essential oil aroma Scenter/Diffuser humidifies and ionizes the air and disperses essential oil scents. Traditional diffusers use heat, but the Mist-De-Light uses ultrasound technology so as not to alter the molecular structure of the oils. This unit also has soft LED lighting in six colors - choose a single color, alternating, or no light at all. Quiet, efficient, safe and easy to use. Automatically shuts off when not in use.