Biometrics
Biometric time clocks are a feature of more advanced time and attendance systems. Rather than using a key, code or chip to identify the user, they rely on a unique attribute of the user, such as a hand print, finger print, finger vein, palm vein, facial recognition, iris or retina. The user will have their attribute scanned into the system. Biometric readers are often used in conjunction with an access control system, granting the user access to a building, and at the same time clocking them in recording the time and date. These systems also attempt to cut down on fraud such as "buddy punching." When combined with an access control system they can help prevent other types of fraud such as ghost employees where employees are actually at work to clock in but then leave for the day only to return after their shift to clock out.
Read more about this topic: Time Clock