> For the complete documentation index, see [llms.txt](https://enless.gitbook.io/centre-aide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://enless.gitbook.io/centre-aide/guides-installation/documentation-en/products/editor-2/use/screen.md).

# Screen

The TX T\&H E-INK AMB model is equipped with an electronic ink (E-INK) display. Unlike conventional displays, the E-INK display is always on and only consumes power when refreshing the data.

#### 1. Startup sequence

When powered on (removing the tab or connecting USB-C), the display shows the following steps:

* "**Hello**" : System initialization.
* "**Connecting**" : Attempting to connect to the network (progress bar visible).
* Result:
  * "**Connected**" : The LoRaWAN network connection is established.
  * "**Failed**" : Connection failed. The device still switches to measurement display, but the data will not be transmitted.

{% hint style="info" %}
The startup sequence displayed on the E-INK screen complements the LED light signals, whose behavior remains identical across the Room Control range for simplified reading of the sensor status.
{% endhint %}

#### 2. Operating display

Once operational, the display permanently shows the following information:

* Main measurements: **Temperature** and **Relative** **humidity**.
* Status indicators (logos):
  * **Battery** : Remaining energy level in the sensor.
  * **WAN** : Indicates that the device is properly configured for the LoRaWAN network.
  * **Link** : Appears when the "Link Checks" (connectivity tests) are valid, ensuring the quality of the connection.

#### 3. Critical battery management

Since E-INK technology keeps the display visible even without power, a safety mode is provided to avoid reading outdated data:

{% hint style="danger" %}
**Empty Battery Alert**

When the energy level is insufficient, the temperature and humidity readings disappear in favor of a large empty battery logo. If this screen appears, replace the battery immediately or switch to a USB-C power supply.
{% endhint %}


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