Smartwatches have become an essential part of our daily life. Not only do they help us reduce screen time — by showing notifications and other important info on our wrists — but they also help us keep track of our fitness and body vitals. But, have you ever wondered how such a small gadget is able to measure pulse, SpO2, stress, ECG, arterial stiffness, and other important body vitals? Here's everything that you need to know!
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