Thanks to some sensors, the system understands the posture of the user and the brightness of the room.
The calculation of the difference between the actual posture and the correct one; the comparison between the room brightness and a reference brightness.
A vibration advises the user if he assumes a wrong posture; sound signals or display messages warn the user about room brightness.
The user can start and stop the system on the user interface. Furthermore he can review the data collected by the system during the day, month, year on the website.