On the back, the Apple Watch features an optical heart sensor to quickly check your heart rate, and an electric heart sensor that works with the crown to generate an ECG (electrocardiogram). The Nike Training Club app provides over 180 free workouts from world-class Nike Master Trainers.
— Read on m.ebay.com/itm/Brand-New-Apple-Watch-Series-4-44mm-Space-Gray-Case-Nike-Black-Sport-Band/183675186645
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