> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/epoc-x-user-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/epoc-x-user-manual/introduction/introduction-to-epoc-x/coverage.md).

# Coverage

![](https://1919735193-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M3ZQLjv5tAtl-bmf54O%2F-M_TVkcyh1N6mG93NhcQ%2F-M_TVxtDsUS2VC8HnlvS%2FEPOCX%20-%20Sensor%20-%20Mapping.jpg?alt=media\&token=19c299c5-0877-4547-afc2-ab4037360ade)

EPOC X provides coverage of the frontal and prefrontal lobes; it also provides coverage of the temporal, parietal and occipital lobes. The image above shows the sensor locations for\
EPOC X using the international 10-20 system.

EPOC X has two electrode arms — each containing 9 locations (7 sensors + 2 references). Two sensor locations (M1 / M2) already have comfort pads fitted as they are the alternative reference positions (P3 / P4).<br>