The scented air freshener has 3 different levels of aroma, so the unit works just as well in a large room as it would in a small room. The electric fragrancer is easy to use, just simply plug the unit into any standard plug socket and begin filling your home with great aromas. Just as you would expect the electric air freshener from Yankee Candle uses the same great true to life scents as their other ranges of fragrances. The electric air fresheners have a long fragrance time of 4 - 6 weeks