Once you open the program, a window shows a graph where you can see the upload and download speed. It also informs you of the peaks and average levels.
If you switch tabs and go from the monitor to the history, you can see a summary of your activity organized into minutes, hours, and days, which is useful to get an idea of when in the day your line is busiest.
BitMeter OS is quite a useful tool that gives you control over the way you use the Internet. The best thing about it is that it runs on a separate tab within your explorer.