> 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/specifications.md).

# Specifications

The EMOTIV Extender is compatible with our latest headsets (Insight, Flex and EPOC+) and is designed to enhance the headset usability by providing longer battery life and data storage. It has four functions:

1. Extends the battery life of the headset.
2. Allows tethering of the headset to your computer. The tether is isolated to provide a safe, reliable connection while minimising the injected noise.
3. Allows a user to record their sessions to a microSD card for later playback and analysis, removing the need to record to a mobile device or PC.
4. Allows an external hardware trigger to inject marker data directly into the raw data stream, improving accuracy of marked events to +/- 1 sample. 

|                                 | **Extender**              |
| ------------------------------- | ------------------------- |
| Connectivity - PC               | USB - Mini B              |
| Connectivity - Headset          | USB - A                   |
| Insulation                      | 2.5kV                     |
| Trigger Input                   | Opto-isolated >2.5V pulse |
| Trigger Minimum pulse           | 100us                     |
| Trigger Edge                    | Rising                    |
| Battery Capacity.               | LiPo battery 1850mAh      |
| Battery life (standby) 70% full | 1 year                    |
| Battery life (SD mode)          | 10 hours                  |
| Battery life (tethered)         | Unlimited                 |
| Battery life (Power Only)       | 7 hours                   |
| Charging Time (1A)              | 2 hours                   |
| SD Card Format                  | FAT32                     |
| SD Card Max Capacity            | 32GB                      |
| SD Card use                     | 8KB/s                     |


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://emotiv.gitbook.io/extender-manual/introduction/specifications.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.