Essential Oil Aroma Diffuser, Air Purifier, Aromatherapy, Colour Change, LED, USB. Aarhus Atomiser – Classic Pod – Timer. Aroma Diffusers are timeless and elegant, they provide a flameless and smoke-free way to fragrance your room or office. Just add some water and a favourite essential or fragrance oil for an instant aroma experience. The Aroma Diffuser use an ultrasonic motor to pump out the water so it’s very quiet during use. As featuring a colour changing mood light and can be used as a simple humidifier. Aroma Diffusers are very easy to operate and maintain, only occasionally having to be filled with a small amount of water and a few drops of scented oil. Size 13.5 x 10.5cm.