Don't waste your money

I found these at Big Lots and thought it would be worth a shot. I put the oil packet into the plug in, plugged the unit into my cars outlet (lighter thing?) and immediately smelled heaven! The first oil packet lasted 3 weeks. Once I replaced it, the entire unit quit working. It was hard to find the refills (only found at my local Big Lots) but my search was for nothing, since my unit quit working. I suppose I could spend the money and just get a new unit every month, but why??