I purchased the Gurin Spa Vapor Advanced Wellness Instant Healthful Mist Ultrasonic Aromatherapy Essential Oil Diffuser as a christmas gift for my sister. She is very happy with it and how it works. I like that it has a safety feature that turns it off when the water level goes too low. This is super important when you have a teenager who forgets to turn things off. It has three different colors- red, blue, and green- that have high and low settings. It has a timer so that she can set the machine to work as long as she wants. This is a great way to start using essential oils to enhance your life.