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  1. Photoplethysmography sensor (proprietary design) 
  2. Electrodermal activity sensor (proprietary design)
  3. 3-axis accelerometer
  4. Optical thermometer*

These sensors are used to produce the following data, available in CSV format though the Empatica Connect dashboard and in real-time via Empatica's mobile APIs:

  • Blood volume pulse,@64Hz
  • Inter beat interval: time, IBI(time) pair
  • Electrodermal activity @4 Hz
  • XYZ raw acceleration @32Hz
  • Skin temperature @4Hz*

E4 is protected against insertion of fingers and will not be damaged or become unsafe if exposed to vertically or nearly vertically dripping water. (IP Code 22)

* Skin temperature is not representative of the core body temperature and should not be used for clinical decision making.