The stopwatch is a useful tool for measuring downloads and uploads within a time span.
You can start the timer by clicking on the "Start" button. If you click on the "Auto start" button, the timer will start automatically when the first data is received. The button will then disappear and a timer displaying the time the stopwatch is running will appear.
The data measured is displayed in the grid bellow, and on the details page. The "U" and "D" meters display the usage of your upload and download bandwidth.
In the options tab you can enable useful extras such as, to make the window transparent or to make the windows appear on top of all other windows.