First, there are now many different brands of these watches coming out of China from many different sellers ranging in price from $25 to more than $100. They are all essentially the same, Most probably use the same custom integrated circuit from the same foundry. I bought one of the cheapest ones but then made the mistake of paying an extra $10 for an extra feature that was misrepresented and of no value to me.
I am keeping the watch! Despite its many shortcomings it is useful to me at the low price.
The worthless added feature was the ability to receive or reject phone calls in combination with my phone.
I did not actually want to do this, I am not too lazy to reach into my pocket, but this was to give me audio on the watch. It did not! For the extra $10 it makes a second blue tooth connection to the phone and vibrates when the phone receives a call. It has no speaker, no microphone, no audio in or out.
Like all of its peers it has dozens of special features like counting steps, calories, sleep time, blood oxygen, heart rate, blood pressure, etc. etc, etc. Most of which are not accurate enough to rely on!
It has very few available watch face designs. It will display a custom background picture but only with a single style of time overlay and no other data. It has no internet connection even when paired with my smartphone, thus is limited to the few functions contained in its semi custom companion app instead of the infinite world of possibilities available via the internet through Android Wear,
(it does not run Android Wear but rather some unknown custom OS)
BUT, as I said I am keeping it! It keeps accurate time on a large high visibility display, has good stop watch and timer functions, is reasonably comfortable, and has reasonable battery life. Not the 7 to 10 days touted, but 2 or 3 days of bright frequent use. much better than my 10 year old 1st gen Android Wear smartwatch which recently died of battery bloat.