Smartwatches like Apple Watch Series 9 and Fitbit Sense 2 can be used to track changes in oxygen level in your blood. Even when you are sleeping!!!
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Smartwatches like Apple Watch Series 9 and Fitbit Sense 2 can be used to track changes in oxygen level in your blood.
If you want to learn more about the other amazing ways we’ve compiled all 150 for you for NO CHARGE!