This Review Title is Beautiful but useless. and the content is: The clip is very nice, good quality and looks really good in my car.  However, the oils that I have dropped in there, and I have used 4 different types so far, do not really smell up the car.  I have it on my air vent and I truly expected at least something.  But nothing at all.  I was thinking that it was because i am not running the heater, but it is summer.  who the heck runs the heat this time of year?  On the last hot day we had i was looking forward to getting into my car after a long day at work and smelling the essential oils I dropped into the unit that morning, but still nothing.  Is there a particular type of oil i need to use?  So far I am not impressed with it as an oil diffuser.  It is gorgeous, but does not do its primary function as far as i can tell.  Would someone be able to advise me on which brand of oils they use to make this work right and make my car smell good?.There are other information for this review, one is This reviewer did purchase it and the other is 5 people think this review is helpful.