The fall detection 'sensing' comes from data gathered by an array of sensors located in the device including multiple accelerometers, a magnetometer and a gyroscope. These sensors capture data that yield over 190 different parameters, such as orientation change, impact intensity and impact speed.
If the analysis determines that a fall has occurred, an alert is automatically triggered. The fall detection feature might not detect all falls. If you do fall, do not wait for the call, always press and hold the button for help when possible.