By using their Smartphone (tool that a day seldom today lends itself to someone else) combined with the features provided by this computer station at the place of detection, a staff person will be marked, the entry or the ' output, with the simple reading of a QRcode displayed on the screen using the device's camera.
The QRcode, which is identification of the place where the reading takes place and time of detection, is automatically changed periodically and a control system will prevent any illegal on the detection.