This Fitbit is a replacement for my first one that lasted for about 5 years ... I will mostly use it for tracking steps and sleep data but the other features are interesting such as the watch-face etc ...
Then, with your replacement 22mm or 18mm bands, you slide the same pin inward ... That's on par with most AMOLED fitness watches like the Fitbit Sense 2 but below the new 2,000-and-up you get on newer ...