The Casio F-91W is famous for being a minimalist, durable, and incredibly cheap digital watch (I got mine for $10 a few years ago). It’s very simple, it only has an alarm and a stopwatch in addition to an infamously weak backlight. The Ollee watch is a drop-in upgrade that gives it some modern smart watch features. On the outside the watch looks the same, even the display is the same, but the module adds world time, fitness tracking, Bluetooth synchronization with your phone, customizable face colors, temperature, games, a flashlight, and an upgraded backlight. I love that one person can make what probably took a team of Casio engineers to do back in the 80s.
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