> 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/introduction/system-requirements.md).

# System requirements

## EMOTIV headset

* Extender is compatible with EPOC +, Insight and Flex
* Ensure your headset has [Extender compatible firmware ](https://emotiv.gitbooks.io/updating-firmware/content/)before using Extender

## PRO license (for [SD card recording mode](/extender-manual/modes-of-operation/connecting_your_headset_-_sd_card_recording.md))

* Required for decrypting data recorded in SD card recording mode
* Visit our [website](https://www.emotiv.com/emotivpro/) to view and purchase a PRO license

## SD card (for [SD card recording mode](/extender-manual/modes-of-operation/connecting_your_headset_-_sd_card_recording.md))

* Extender compatible with microSD cards 4-32GB formatted to FAT32
* microSD card not included

## EMOTIV app (for [SD card recording mode](/extender-manual/modes-of-operation/connecting_your_headset_-_sd_card_recording.md))

* Required to decrypt data saved to an SD card or computer
* Visit our [website](https://www.emotiv.com/developer/) for more information about EMOTIV App and to download. 
* EMOTIV app user manual available [here](https://emotiv.gitbooks.io/cortex-manual/).


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