The refill for the Maison Berger aroma diffuser comes ready to use, which means you don't need to add anything to the refill. So you can use the refill right away. To use the diffuser, just place the refill in the diffuser and use the remote control to adjust the settings to your liking. In this set, you get the aroma diffuser, refill and remote control delivered in a beautiful gift set. This makes it a perfect gift for yourself or for someone else who loves a pleasant scent in their home. With the Maison Berger aroma diffuser you can easily create a pleasant and personalized fragrance experience in your home.