ECGs are used to diagnose irregular heartbeats, or arrhythmias, a common type of medical problem that can also be the result of a heart attack. AliveCor's monitor is built into a case that slips onto an iPhone. It has two electrodes that pick up voltage changes on the skin—the ECG signal—produced by the contraction of the heart. A low-power wireless transmitter sends the signal to the phone. Power comes from a lithium watch battery that Albert claims will last for 180 hours of continuous use.
via MIT Technology Review <--- Check the video!
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