The Sensed Devices widget displays the number of BSS, Wireless Clients, Unknown, and BT/BLE devices identified by AirDefense in your network.
Use the drop-down list, located to the top right of this widget, to change the duration of the data that is displayed. By default, data for the last 1 Hour is displayed in the widget.
Hover on any of the widget's data points to view specific information on the selected data point. When hovering on a part of the Pie chart, the section of the chart under the mouse pointer is exploded out.