> For the complete documentation index, see [llms.txt](https://sensorbeeab.gitbook.io/sensorbeeab-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sensorbeeab.gitbook.io/sensorbeeab-docs/readme/sensorbee-air-product-manual/sensorbee-air-pro-2/quick-start-guide/2.installation-guide/3.-parts-of-air-pro-2-cellular.md).

# 3. Parts of Air Pro 2 Cellular

![](https://4165632867-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FAfz0SPFdCKHwNzFS2Bnv%2Fuploads%2FdUfmaeTwky4WJLbwn27s%2Funknown.png?alt=media\&token=1665f6e9-0f0f-4346-88c5-d6f4a5ab8cd8)

<sup><sub>Figure 2: presentation of the connectors of Air Pro 2.<sub></sup>

1. Inlet for internal gas sensors and humidity and pressure sensors
2. Temperature sensor
3. Power switch
4. Expansion connector, M12, 8pin, Modbus RTU sensors (5-12V support)
5. Status LED, which indicates the status of the unit.
6. Power connector, M8M-4 (Type A), for input power to the unit (5 - 24 VDC)
7. Expansion connector, M8F-6 (Type A), for Sensorbee external sensors.
8. Expansion sound level sensor, bought separately, otherwise it’s replaced with a plug.