I'm looking for a diffuser that does NOT have a light, so I can keep my room dark. Does this one have a light?
This aroma diffuser does NOT have any lights. It simply only has one feature controlled by the one button - turn on and off.
Does this model have auto shut-off?
Yes, you don't have to worry. Once there is no water in the system it automatically shuts off.
Has anyone used this for citrus oil?
Yes, I have used the serenity model with grapefruit, orange, lemon, lime and bergamot. Usually, I diffuse other oils with the citrus, but I have not had any problems or seen any evidence of damage to the plastic with up to 6 drops of citrus oil.
How do you know if an essential oil is aromatherapy grade oil?
There are many different makers and sellers of essential oil; typically aromatherapy grade essential oil are the most pure and doesn't contain any base or fillers. The manufacturing company would provide purity testing, track record of materials, extraction methods, testing data like gas chromatography, infrared spectroscopy, refractive index and specific gravity as examples. All in all, research would be your best friend.
Where is this made?
Made in China.
Can this be used with citrus oils?
Absolutely. I use a lot of citrus based oils in mine and have not had any issues.
What color is the cord? Is it quiet? Will it leave vapor on my table?
The color of the cord is white. The diffuser is quite; it uses an ultrasonic plate to generate mist and a small fan to push the mist out. It typically does not leave vapor on table; but if your area is extremely humid, it can.