Yes, so that your class attendance can be counted.
For class attendance to be counted correctly, the card must be swiped at the reader within the following period: 10 minutes before the start of the lesson until 10 minutes before the end of the lesson.
In other words:
In a class from 8:00 to 9:30, the card must be swiped at the reader from 7:50 to 9:19;
In a class from 9:30 to 11:00, the card must be swiped at the reader from 9:20 to 10:49.
If the RFID reader’s LED turns green or yellow, the presence has been correctly recorded.
If the LED turns red, the presence has not been correctly recorded.
Additional information: the RFID reader is located inside the classroom.