# 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/). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://emotiv.gitbook.io/extender-manual/introduction/system-requirements.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.