Silentnight Colour Changing Air PurifierBreathe in cleaner air with soothing fragrances to help you sleep Create a fragranced atmosphere in your bedroom and get a great nights sleep with this colour changing air purifier. Simply add water and a few drops of your favourite fragrance to create the perfect ambiance for your slumber. Further add to and change the mood by choosing from six different colours. Choose between automatically changing colours, one steady colour or leave the light off