One of the most distinct elements of the new Apple Watch is a set of four rings built into its backside, but they're hardly there for style: inside those four rings are sensors that the Apple Watch uses to measure its wearer's pulse. The sensors include infrared and visible-light LEDS in addition to photosensors, which all work together to detect heart rate. Using that information, Apple says that it can begin to put together a comprehensive look at a person's daily activity.
Though Apple is putting a focus on these four rear heart-rate sensors, there's a bit more than that at play. There are other sensors inside of the watch that will contribute to building your fitness activity — likely a pedometeter, for one.
The sensors won't just...
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