These Reed Diffusers are perfect! Such a wonderful, cosy smell. You can control the strength of fragrance by turning the ends of the plain stick reeds in the oil. The cute flowers offer a nice release of fragrance as well. I have 2 diffusers in a large family room that is in the basement. The room always smells divine! They have been in use for 2.5 months and have about half of the oil left yet. Turning the reeds may have used the oil faster. When these are gone I will definitely replace them with more! Love the product!