Huami has been teasing the second-generation Amazfit GTR and GTS smartwatches, with a new promo poster simply announcing the new products will be "Beyond GT". There is some expectation that the Amazfit GTR 2 and GTS 2 wearables will feature enhanced health functions that include a blood oxygen sensor.
https://www.notebookcheck.net/Huami-Amazfit-GTR-2-and-Amazfit-GTS-2-smartwatches-to-launch-soon-Contemporary-looks-and-possible-blood-oxygen-sensor-for-the-second-generation.494203.0.html
Well, that's nice.
How is this Oxygen sensor different than Garmin Vivoactive 4?
Honestly all smartwatches junk are just as useless as it was designed for! Save the money and free the wrist fir a better life! The money better spend on something else and not a dumb s*** on the wrist!