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I like the ZTE Watch, it includes popular features like heart rate, spo2, sleep-- among many other features. There is no GPS or connectivity other than Bluetooth but it does an OK job with notifications. That's one area I'd improve better, more supported notifications. Overall though I like it.
This is my first SmartWatch and I bought it to monitor my heartrate and oxygen levels, because I have to work in a mask. The watch performs well and I compared its measurements to other devices. It does seem to be rather accurate.
I am taking off a star, because there is no manual anywhere. I contacted ZTE and they still couldn't send me a copy of the manual.
The app that needs to be installed to link the watch to the phone must be improvement in the ENGLISH LANGUAGE. It seems that ZTE used some bad translators. There are some grammar concerns which make readouts confusing to understand, in particular when it comes to sleep analysis.