| Accelerometer |
Covered distance, speed, static/inactive and time periods of movements |
| Actigraph |
Physical progress, activity - rest cycles, circadian-rhythm cycles |
| Barometer |
To measure the air density |
| Bluetooth |
Identify adjacent Bluetooth enabled devices |
| Blood pressure monitor |
Systolic and diastolic cycle of the blood, Eye gaze, light |
| Electro Cardio Gram (ECG) |
Heart rate activity, heart rate variability |
| Electro Encephalon Gram (EEG) |
Monitoring the brain activity |
| Global positioning system (GPS) |
Location, duration of the movement, speed, proximity |
| Gyroscope |
Gyroscope rotation of the device |
| Light sensor |
Measures surrounding and device light |
| Magnetometer |
Direction, field strength |
| Microphone |
Speech communication |
| pH monitor |
Stomach acid secretion intervals |
| Temperature sensor |
Skin and ambient temperature |
| Wi-Fi |
Location and signal strength of networks |
