> 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/aranet-rn+/aranet-radon-plus/documents-and-firmware/firmware-changelog.md).

# Firmware Changelog

v1.15.15:

* Improved radon concentration calculation algorithm on both Home and Pro devices.
* For Pro (only) devices:
  * The new [Sensor Lock feature](/aranet-rn+/aranet-radon-plus/usage-and-measurements/sensor-lock-feature.md) is released.

v1.11.3: 

* Improved low battery detection.
* Improved radon concentration calculation algorithm.

v1.9.1: 

* Increased maximum displayable radon concentration to 7900 Bq/m<sup>3</sup> (214 pCi/L).
* Improved radon concentration calculation algorithm. GUI:
* Improved menu structure.
* Added sensor ID on pairing screen.
* Improved icons.

v1.8.0:

* Added "measurement over measurable range" indication.
* Sharper display image after fast transitions. Stability enhancements:
* Improved display driver stability.
* Data processing improvements.

v1.7.2:

* Improved battery life.
* Improved high-humidity environment detection.
* Fixed average values storage.

v1.7.0:

* Improved battery life.
* Fixed the average values storage bug.
* Improved high-humidity environment detection.

v1.5.14:

* Improved battery life.
* Improved concentration averaging algorithm.
* &#x20;GUI improvements.

1.5.11 Initial Firmware


---

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