> For the complete documentation index, see [llms.txt](https://help.aranet.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.aranet.com/aranet4/aranet4-home/usage-and-measurements/where-to-place-the-device-in-a-room.md).

# Where to Place the Device in a Room

The Aranet4 can be placed anywhere in the room where you tend to spend a lot of time – on a surface, or mounted on the wall, where it can be comfortably seen. Since people and animals exhale CO₂, the readings can be momentarily higher if you breathe directly on the sensor, so holding the sensor in your hand can sometimes give a higher measurement. However, placing the sensor near a window or entrance door might give a slightly lower reading because of the airflow in these areas.

The Aranet4 should not be placed in direct sunlight or in areas with a risk of splashing the sensor with different liquids, or high-humidity environments (higher than 85%), such as your bathroom. Place the sensor in a safe place where it cannot accidentally be dropped because it isn’t drop-proof.

When placing the sensor, make sure the openings on the sides of the device aren't covered.


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