Fulfillment by amazon (fba) is a service we offer sellers that lets them store their products in amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products.. The heart rate sensor in apple watch uses what is known as photoplethysmography. this technology, while difficult to pronounce, is based on a very simple fact: blood is red because it reflects red light and absorbs green light..
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Over time, the apple watch has grown into quite the everyday heart rate monitor, but things have ramped up considerably with the new series 4 and watchos 5. after dipping into some basic heart.
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