How do I access more information about a device broadcast?

The button can be found in the results panel to the right of each event record.  Clicking this button will open the broadcast details page.  This button is also found in the pop-up that opens when a device location on the map is left clicked.

The broadcast details page shows the broadcast timing information, location information and additional device data specific to the device for that broadcast.  The additional broadcast fields may include broadcast cause, battery status, speed, heading, altitude, alarm information and other meta data recorded by the device sensors.