oil burner Aromatherapy oil tealight thingy.
Put water into the top bowl, add some drops of Aromatherapy oil,
put a tealight candle into the bottom and light the wick.
Safety health considerations can be looked at, or more harmoniously, look at three aspects to whatever you do,
so that commonsense may guide you by expanding your mind about what you do.
Also, many candles may be 3 hour or more,
so consider to add extra water at some stage, or also maybe choose to not pick such a long burning candle?