The devices contains two Plessey PS25201 EPIC sensor (one for each thumb) and the software on the smartphone/tablet can perform simple analysis to display the heart rate.
The sensors work by detecting the electrical potential in the air (about 100V per metre of height) and the disruption caused by the human electrical signals.
The sensors can also be used for non-contact heart rate detection, but there is a lot more ambient noise to remove and requires more complex software for analysis.
The EPIC sensors can also be used to detect people through walls using clever software.
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