ODM USB Small Optical Sensor Fingerprint Reader Scanner

There are three common methods of fingerprint identification, namely ultrasonic, optical and semiconductor (capacitance), but the basic principle of the three methods is to compare the fingerprint to be identified with the fingerprint entered to determine whether it meets the requirements. The difference between optics and semiconductors lies in the different ways of replication. The former uses optical scanning, and the latter uses finger grooves to record the different fingerprints of the...