If you write code for the f91w you'll quickly realize you can't actually control every segment: https://www.sensorwatch.net/docs/wig/display/#limitations-of-the

If you write code for the f91w you'll quickly realize you can't actually control every segment: https://www.sensorwatch.net/docs/wig/display/#limitations-of-the-weekday-digits https://www.sensorwatch.net/docs/wig/display/#limitations-of.... Some digits have only 4, 5, or 6 controllable segments. But that's probably not what the author was getting at :)