This ultrasonic diffuser we call the Bubble due to it's shape, it has 3 clear bubbles on the front which look amazing when it's lit up. This is a very effective diffuser that has a sizeable hole in the top to allow a good amount of mist to diffuse. Bowl hold 400 mls of water, the timer settings are 1 hour, 3 hour, 6 hour or run full time. This machine will automatically turn off if it runs out of water. Lighting has 7 different colours allowing you to choose a set colour or let the machine rainbow through all the colours, you can also turn the lights off and leave the machine run, very effective while you sleep.