Casio’s Pro Trek sub-brand offers a lot of the same features and toughness as its brother-brand, G-Shock, but with more of a focus on pragmatic functionality — and a bit less of the brash attitude. Specifically, Pro Trek is intended for outdoor enthusiasts or professionals with a range of features that are genuinely useful, and the tech just keeps expanding. The newest Pro Trek line is the PRT-B50 series, and it introduces the latest technology, which includes an accelerometer and smartphone connectivity.
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https://gearpatrol.com/2019/09/12/casio-pro-trek-prt-b50-series-watches/