Xiaomi's Smart Band lineup is among the most popular smart wearables on the market. And yet, even in its ninth generation, it manages to add important upgrades to stay relevant. This is the Pro model (we reviewed the regular a few months ago) and it adds a bigger display, nicer build, and a GPS tracker for runners. Version nine brings an 18% bigger battery than its predecessor, bumping the expected standby from two weeks to 21 days. The screen has kept its size and resolution, but it's now twice as bright as the older model. Xiaomi also added a linear vibration motor for more pleasant...
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