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Edição por Tobias Isakeit —
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| [* black] What we're left with, is the frame with the digital crown re-engineered and tightly attached but still with a physical button that clicks. | |
| - | [* black] A small circuit board on the back of the digital crown lets us guess that there is more to it. |
| + | [* black] A small circuit board on the back of the digital crown lets us guess that there is more to it. It is definitely needed to perform the promised and FDA cleared ECG. |
| + | [* icon_note] Where commonly 10 electrodes are used to form 12 ECG leads, the Apple Watch with its two electrodes is capable of performing just one single lead, [https://en.wikipedia.org/wiki/Electrocardiography#Limb_leads|the Lead I]. |
| + | [* icon_note] This is done by using the arm the watch is on and the finger of the other arm that touches the digital crown to get reading on the voltage between these two point. With the heart beating the voltage changes and the watch can extrapolate from there. |