| - | [* black] We turn our attention to the back of the case, where we find a ceramic cover with sapphire lenses that protects a specially designed heart rate sensor that uses infrared and visible-light LEDs and photodiodes. |
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| - | [* black] Alongside the edge opposite the digital crown, we spot the speaker and microphone ports. |
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| + | [* black] We turn our attention to the back of the case, where we find a ceramic cover with sapphire lenses protecting a set of LEDs and photodiodes. |
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| + | [* icon_note] The specially designed heart rate sensor uses a combination infrared and visible-light to gauge your heart rate. |
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| + | [* black] Opposite the digital crown, we find the speaker and microphone ports. |
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