The fragrance device should always be adapted to the room you want to scent. Fragrance stones, for example, have a very small fragrance radius and are especially suitable for the desk or nightstand. Small ultrasonic nebulizers such as the TaoWell Mini or the TaoStone thermal fragrance stone are suitable for smaller rooms up to about 15sqm.
For larger rooms up to about 30 sqm, a larger nebulizer like the TaoWell Yogini is suitable, and for very large rooms, the TaoWell Natura is suitable, which scents rooms up to 40 sqm. Otherwise, you can also change the dosage a little, for example, by adding a few more drops of oil into the nebulizer. However, for larger rooms should definitely get a larger device, so that the scent is not too intense near the device.