Device counts are displayed in the top right-hand panel of Analytics interactive charting:
This figure is the aggregate number of unique Devices recorded for the time/location range selected.
Note that Device counts are calculated by reference to Visits. A Visit commences when a Device enters a Region and ends when a Device exits the same Region. A unique Device may make multiple Visits.
Therefore, in order for the system to include a Device in the “Device Count” figure, that Device must have completed a visit to at least one Region. Incomplete Visits (i.e. where no exit from the Region was recorded) are not included when calculating Visitor Counts.
For very large Regions, it is therefore possible that a lower Device Count figure than expected may be observed, because of incomplete Visits.