Since the installation direction is correct, there are two additional factors that can affect the perceived scent strength:

1. Room ventilation: If the air in your room circulates quickly (e.g., windows open, AC or fans running), the fragrance may be dispersed rapidly, making it seem fainter. We recommend using the aromatherapy feature in a room with less ventilation for a more noticeable effect.
2. Olfactory adaptation (scent fatigue): If you spend extended periods of time in the same room where the robot is working, your sense of smell will gradually adapt to the fragrance, making it seem less noticeable over time. This is a normal physiological response of the human olfactory system — similar to how you stop noticing your own home's smell after living in it for a while.

Regarding the second point, this is a natural physiological response and not an issue with the aromatherapy feature itself. Unfortunately, this cannot be fully addressed through technical means. You may try using the aromatherapy feature and briefly leaving the room, then returning later — you may notice the scent again upon re-entering.

If you have any other questions about the S2 Pro, please don't hesitate to contact eufy Support Center for further assistance.