> This watch costs twelve dollars. It weighs twenty-one grams.

> This watch costs four hundred dollars. It also tells time. > It also tracks my steps, monitors my blood oxygen, measures my sleep quality, logs my workouts, reminds me to breathe, reminds me to stand,

I had quite opposite experince with casio. If I want water proof (like swimming) watches, I would have to buy bulky and super expensive gshock with GPS and tons of useless festures.

$20 chinese smart watch are completely water sealed, tiny and simple to use. I can even remove wrist band, to make them even smaller. Only downside is battery life is only one week.