> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/extender-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/extender-manual/getting_started/extender_led_functionality.md).

# Extender LED Functionality

## ![](https://lh6.googleusercontent.com/vjxBEsPXNMw0WJ2D8vGkrH-lmXrg8EFwGYZT9ciVHuG7xv4AUF5m4H4vwXNPQpq0Yvw8aQUjfXuur0mlNr84NEHWjmdhleQZli9FKTidpX5JerYpYS9GsqxBMwk1HKAh35hsjThc)

## Status LED - Indicates the status of the Headset connection

* **Off:** Extender is switched off.
* **Green:** Extender is on, but it is not recording.
* **Orange:** Extender is on, it had detected the headset, but it is not recording to the SD Card
* **Solid Red:** Extender is on and it is recording to the SD Card
* **Blinking Red:** Extender is on, and is finishing writing on the SD Card. This corresponds to when, after the recording is turned off, the Extender needs to flush the data and close the file on the SD Card.
* **Fade on/off:** firmware update failure

## Power LED - Indicates the status of the Extender

* **Off:** Extender battery is not charging either because the Extender is not plugged into a charger or because a charging fault condition has been detected.
* **Blinking Orange:** Extender battery is charging at 100mA.
* **Solid Orange:** Extender battery is charging at 500mA.
* **Red:** Extender battery is charging at 1A
* **Green:** Charging is complete


---

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