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- | [* black] A small circuit board on the back of the digital crown |
- | [* icon_note] Where commonly 10 electrodes are used to form 12 ECG leads, the Apple Watch with its two electrodes is capable of |
- | [* icon_note] This is done by |
+ | [* black] We're left with 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 makes us think there's 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 forming just one single lead, [https://en.wikipedia.org/wiki/Electrocardiography#Limb_leads|the Lead I]. |
+ | [* icon_note] This is done by reading the voltage between the arm the watch is on and the finger of the other arm touching the digital crown. With the heart beating the voltage changes and the watch extrapolates from there. |