The Device Summary option (Central Manager → Dashboard → Device Summary) enables you to view details about Managers that are connected to the Central Manager. Similar to how a Manager manages devices such as Sensors, a Central Manager manages a set of Managers. So, in the Central Manager dashboard, the term device refers to a Manager managed by the corresponding Central Manager and does not refer to devices such as Sensors. Therefore, the Device Summary of the Central Manager displays details such as device name, version number, last synchronized time, and synchronization status of the corresponding Managers.
Device — Name of the Manager connected to the Central Manager. This is the name that you entered for the Manager on Central Manager's Add and Remove Manager's page. The device name is actually a hyperlink which takes you to the respective Manager's Manager page.
Version — Version of the Manager
Last Synchronized Time — Time when the Manager was last synchronized with the Central Manager
Synchronization Status — This column displays Up-to-date if the synchronization is up to date. If not, the column displays Changes pending as a hyperlink. The Changes pending hyperlink takes you to the Synchronize Policies page.