A:AnswerHi there,
Yes , the GTS 2 Mini is compatible with the Samsung Galaxy A 21 running Android OS 5.0 and above running the Zepp App , the Watch uses RTOS.
Kieron | Amazfit support
A:AnswerHi there,
the GTS 2 Mini can only control music being played on the phone both local and streaming , however you can download mp3 music to the GTS 2 , GTR 2 , GTR 3 Pro , GTR 4 and GTS 4.
Kieron | Amazfit Support
A:AnswerHi there ,
the GTS 2 Mini can track Blood Oxygen asa single measurement or automatically like sleeping early , tracking oxygen while working our would be VO2Max only available on our T-Rex Series.
Kieron | Amazfit Support
A:AnswerI don't believe it does. Not seeing anyway to add apps that aren't already on it. I haven't tried to add any other apps or even connect it to the Alexa. I like my watch as just a fitness/sleep tracker.
A:AnswerHi there,
the GTS 2 Mini Display has an AMOLED display which has an automatic brightness setting allowing you to see the watch in very or very dark environments , the display on the Bip was transflective which absorbs the sun's light to display in bright sun conditions , so as the displays are totally different they can't be replicated by a setting.
Sincerely,
Kieron | Amazfit Support