In these types of devices, the pulse is measured with the assistance of an optical sensor. Because I do not believe that it is possible to measure the pulse in a manner that is more or less accurate using this method, the incapacity of the device to deal with this task is most likely not a flaw unique to this particular device, but rather one that is shared by all fitness bracelets in general. As the monitoring of sleep appears to be based on the measurement of the pulse, we might conclude that it is pointless. And the use of a wrist bracelet to determine the amount of oxygen that is present in the blood is, in my opinion, completely absurd! In addition to that, verifying the correctness of such measures is not an easy task. I didn't make an attempt to calculate the distance, but it seems evident that any smartphone is capable of performing this duty at least as well as any other, with the exception that you don't have to carry the phone in your pocket at all times. So, in this context, the device is virtually pointless. In conclusion, the device is only suitable for use as a vibration alarm, which is incomparably superior to conventional "sound" alarms. Additionally, it can be used as a "vibration notification" about calls and other events; however, all of this can be found in cheaper models, and I do not see any reason to overpay for non-working functions.
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