The Crystal Aire Light Shadow Aroma Diffuser is a diffuser come night light. Uses water with a few drops of essential oil. It uses ultrasonic technology and high frequency vibration to diffuse the essential oil. LED colour changing lights through from red, blue, green, orange and yellow. It comes with 3 different interchangeable designs for the light to shine through which are easy to replace in the lid. Made of ABS and PVC.It uses an AC adaptor with a DC plug.