If it were an option, I would give this product zero stars. It was an absolute waste of money. I put this item in my car and was so excited to use my essential oils with it. I found that it did not affect the smell of the car at all. When I put new drops of oil on the pad, it would completely absorb the oil and there would be a very slight scent for about an hour and then it would dry out. I found that I kept having to reapply drops and ended up wasting an entire bottle of lemon-scented essential oil without ever finding that it worked successfully. At times I would put 10 -15 drops to get it super saturated and even then I could hardly smell a thing. PLEASE SAVE YOUR MONEY. It is not worth it AT ALL. I regret not looking at other reviews before buying this item. By far one of the worst purchases I have ever made. I will not shop at Saje for anything ever again because this was just so terrible.