Fingerprint attendance machine

1. How does fingerprint attendance machine work?
2. What is fingerprint attendance machine called?

How does fingerprint attendance machine work?

The fingerprints of every employee are scanned and then mapped using various system coordinates. The system then plots these coordinates against a graph and stores them. If the coordinates of an employee's finger are mapped and compared to those of the preceding image, only then is the entry counted.

What is fingerprint attendance machine called?

BioMax LX-16 Fingerprint Biometric Time and Attendance Machine.