Interactive visual guides to the technology inside your health devices
Photoplethysmography
How your watch reads your pulse with light
Electrocardiogram
Reading your heart's electrical signals
Inertial Measurement Unit
Detecting every movement and orientation
Skin Temperature Sensor
Tracking your body's thermal signature
Pulse Oximetry
Measuring blood oxygen with red and infrared light
Bioelectrical Impedance Analysis
Measuring body composition with electrical current