# Modes of operation Extender has four modes of operation that you can choose from to best suit your needs: 1. **Power-only mode** extends the battery life of your headset 2. **SD card recording mode** allows you to record data to the Extender, rather than to a computer or mobile device 3. **Pass-through mode** directly records data to your computer, bypassing the wireless feature 4. **USB drive mode** allows you to access the data on the SD card when connected via USB. --- # 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/modes-of-operation.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.