I bought this item to track my heart rate during exercise. So far it does, and the readings are consistent with other tools I might use to measure heart rate. Obviously this device is not as accurate as a medical device, nor do I expect it to be. This is for reference only. Other features like the pedometer work fine but I haven't checked the results in the app on my phone. I haven't tried call notifications yet. The sleep feature gives me some interesting information that I could use to improve my sleep, which isn't so good. Overall I think this smartwatch is good value for money. My only complaint and reason for the 4 star rating is the charger. This is very bad design. The stand must be designed so that the clock fits completely into the base so that it does not tip over or lose contact with the pins on the stand.
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