> 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.md).

# Extender Details

The Extender has been designed to be small enough to fit into the pocket of a shirt or attached to a lanyard. It features two USB ports which are electrically isolated to connect to a headset and your computer. When connected the headset should be visible in in all EMOTIV software. It features one button for both power on/off and recording start/stop functionality. A microSD card slot is located on the side to allow users to fit a card to store recordings for offline analysis.

There is a hardware trigger input utilizing a 2.5mm audio socket pictured below.

![](https://lh3.googleusercontent.com/aPk1UehV4UdSLISsZlZ_FdtJL4-bGmvUCHM5cpL7sDM6uCtcEIhNU674CejCkSn88CHEmaNmmBJsWV6GtOs3zr26Xtg3HjTkNS1cZE6DYfBcdv-yeBHLQzBzQmtUVBQxQnM3cm8G)


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