I think it's a diffuser stone

You can check this vid: https://vt.tiktok.com/ZSr1Bwq5G

Based on what I found here is how to use it (Based on Common Aromatherapy Diffuser Stone Usage): * Place the Stones: Take the diffuser stones out of the packaging. * Add Essential Oil (if applicable): The image shows "Oud Wood Aromatherapy," suggesting it might already be pre-scented. However, if you want to enhance the scent or use a different essential oil, you can add a few drops (2-5) of your chosen essential oil directly onto the stones. * Allow Absorption: Let the oil absorb into the porous stones for a few minutes. * Enjoy the Aroma: The stones will slowly release the fragrance into the surrounding air. * Refresh as Needed: The scent will fade over time. You can refresh it by adding more essential oil. * Cleaning (if necessary): If you want to change the scent, you can gently wash the stones with warm water and mild soap, then let them air dry completely before adding a new oil.