Time and attendance systems (T&A) are used to track and monitor when employees start and stop work.
Such machines were used for over a century but have since been phased out and replaced with cheaper automated systems which eliminate the need for payroll staff to manually input employee hours.
Originally this consisted of using a RFID electronic tag, a barcode or a QR Code badge but these have been replaced by biometrics (vein reader, hand geometry, fingerprint, or facial recognition), and touch screens devices.
The latest technology allows the use of app (application software) based geo-fence capabilities.
Facial recognition systems are also available with these app based software technologies, eliminating the need of fingerprint scanners.