Which device is frequently present in smartphones and other mobile devices and can be used for multifactor authentication because it can pinpoint a person's location on Earth?

A magnetometer can be used to determine a person's location on Earth by measuring magnetic fields. The location is compared to an allow or block list as part of multifactor authentication, and access may be given if the device being accessed is at an allowed location. In order to decide if access should be permitted, the biometric device retina scanner scans a person's eye. A key fob, which is a type of hard token used for authentication, will create a new code every few seconds.