This fragrance diffuser is easy to use, but the fragrance bottle got used up in one day. I had ordered 2, and one didn't work, but the seller refunded me promptly. You can't reuse the bottle of fragrance by putting another fragrance in it because it may damage the unit. It Does put out a really nice scent in the air, but with the bottle being used up in one day, it doesn't make it cost effective.