The top-end fitness tracker in its lineup, the Jawbone Up4 can measure your heart rate, track your sleep, set your thermostat automatically, and even be used to pay for things at the store. So why does this $199 device feel overpriced? A lot has to do with the way its hardware is underused.

Design

Aesthetically, there’s no difference between the Jawbone Up3 and the Up4. Both are stylish plastic bands whose insides have five square metal contacts; these are used to measure your heart rate. On the top are three indicator lights for sleep, activity and notifications.
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