Check this out,
Hubmar. How does it work? All you have to do is take a scentball pad, put 3 to 5 drops of scented oil from Dropwise Essentials on the pad, place the pad in the ball and plug it in the wall. I plugged the ball in an outlet in my living room and I could smell the aroma throughout the entire house. If you want the smell to be preeminent put a few more drops of oil on the pad before placing the pad in the ball. Hubmar has created a scentball for both 110 and 220 volts. Dropwise Essentials has a variety of citrus oils and 5 essential oils including; Lavender, Tea Tree, Peppermint, Eucalyptus, and Geranium. I plug in my scentball in the morning so I can feel relaxed as soon as I walk through the door after a hard days work.