> 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/placing-the-sensor.md).
# Placing the Sensor
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.
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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.
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For better experience place the sensor at breathing height.
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The Aranet4 should not be placed in direct sunlight or in areas with a risk of splashing the sensor with different liquids, or in 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.
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When placing the sensor, make sure the openings on the sides of the device aren't covered.
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## Mounting the sensor on the wall
Such mounting is normal and will not affect the device measurement precision, as air vents are located on the sidewalls of the device body.
There is even a custom-made [**Aranet4 anti-theft wall mount**](https://aranet.com/en/pro/products/wall_mount_bracket) from us as the manufacturer that can be used to secure the device in its installation place. It also works with an Aranet2
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