A Literature Review: Form Factors and Sensor Types of Wearable Devices

Wearable devices provide a new way to recognize the users context with high accuracy. Selecting suitable form factors and sensors are important to recognize users' contexts. In this study, the form factors and sensor types of released, prototype, and concept products were explored. A total of 175 literatures were collected and analyzed in terms of sensor and form factor. Thirty sensors were collected and classified according to measurands. Twenty-three form factors were listed by nine applicable body parts.