# Coverage
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).
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