Table 1 Sensing capabilities commonly found in wearable devices.
Sensor | Description | Privacy invasiveness |
|---|---|---|
26Accelerometer x | Measures the acceleration force that is applied to a device | Low |
26Magnetometer x | Measures the geomagnetic field strength | Low |
26Gyroscope x | Measures a device’s rate of rotation around each of the three physical axes (x, y, and z) | Low |
27Ambient light | Measures ambient light level | Low |
28Proximity x | How far away an object is from the phone’s screen | Low |
26Touch state x | Records movement, pressure, and size of screen touch interaction | Medium |
29Screen state | Records every time the screen is turned on—off | Medium |
30Video | Captures video and pictures | High |
26GPS x | Provides user location coordinates | High |
28Wi-Fi x | Provides data about the BSSID and signal strength of the nearby Wi-Fi access points | High |
31Cell towers | Provides information aboutthe nearby cellphone towers | High |
28Bluetooth x | Detects nearby Bluetooth capable devices | High |
28Ambient temperature x | Measures the ambient room temperature | Low |
26Pressure x | Measures the ambient air pressure | Low |
32Galvanic Skin Response | Measures electrical conductance of the skin | Medium |
26Electrocardiogram x | Measures heartrate activity | Medium |
28Skin temperature x | Measures the temperature of the skin | Medium |
