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Changes to Step #4

Edit by Sam Goldheart

Edit approved by Sam Goldheart

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[* black] We turn our attention to the back of the case, where we find a composite cover with hard coated optical polymer lenses protecting a set of LEDs and photodiodes.
[* black] The specially designed heart rate sensor uses a combination of infrared and visible-light sensors to gauge your heart rate.
[* icon_reminder] Unlike the Apple Watch Sport, the back cases of the Apple Watch and the Apple Watch Edition feature a [http://www.precision-ceramics.com/3-reasons-apple-used-zirconia-ceramic-in-the-iwatch/|zirconia ceramic|new_window=true] cover with sapphire lenses.
[* black] Opposite the Digital Crown, we find the speakermicrophone and microphonespeaker ports.
[* black] Opposite the Digital Crown, we find the speakermicrophone and microphonespeaker ports.