# Introduction *⚠️ **Legacy Product Notice***\ *The EMOTIV Extender is no longer sold or supported. This manual is provided for historical reference only.* The EMOTIV Extender accessory adds even more mobility and marker accuracy to your EMOTIV headset. An essential companion product for your Insight, Flex and EPOC+ headsets, the EMOTIV Extender is a mains isolated external rechargeable battery pack with a microSD card for external storage. EMOTIV products are intended to be used for research applications and personal use only. Our products are not sold as Medical Devices as defined in EU directive 93/42/EEC. Our products are not designed or intended to be used for diagnosis or treatment of disease. --- # 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.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.