beautiful but useless [SEP] 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 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