The large aroma diffuser uses ultrasonic waves to vaporise water and the essential oil* in the tank to produce a cool, dry, fragrant mist. It has a larger tank capacity and can diffuse a fragrance in a room three times the size of the original aroma diffuser. Includes transformer with EU and UK plug attachments. The white cylinder also houses a lamp that shines with an ambient glow and has 2 light settings. Its flame free and safe for use around children and pets. Operation time - 30 60 120 180 mins. Dimensions are 168 x 121mm. *Essential oils not included.