I had used this Opta SB 002 smartwatch from 1 month. I had seen many problem in this smartwatch.
First problem is that in this watch display looks good in pic but in real its loog is not good. Brightness is very low and the characters not looks clear in the display.
Second problem in this watch is its belt you feel not feel cofortable when you wear this you have to adjust always.
And quality of this watch is also poor.
I am not satisfied with the result of this smartwatch.