A biometric device is a security device that uses a person’s unique physical or behavioral characteristics to identify or authenticate them. Biometric devices can use a variety of characteristics, including

Fingerprints: A fingerprint pad or sensor captures the user’s fingerprints
Facial images: A device’s camera captures the user’s face
Iris scans: An iris scanner captures the user’s iris
Voice recognition: A voice recognition system analyzes the user’s voice patterns, such as pitch, tone, and pronunciation
Palm vein scanners: A palm vein scanner uses near-infrared light to capture an image of the veins in the user’s palm
Operator signatures: A biometric mode that records the way a person uses a device or system