A biometric scanner is a pattern recognition which makes a personal identification based on a person’s unique physical characteristics. Biometric scanners can use face recognition, fingerprint matching, iris and retinal scans, voice recognition and hand geometry. Biometric scanners can be built into mobile phones, desktop and laptop computers, and smart cards. They can be used to control entry to buildings and can even replace keys in cars.

Advantages:

There is no need to remember to carry personal identification.
The person has to be present. This makes identification theft and fraud much less likely.

Disadvantages:

Identification using biometric scanners is not yet sufficiently accurate. Permitted users will not be recognized at times, and blocked users will sometimes be permitted.

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IGCSE Input devices