HF4000 is an optical fingerprint scanner that complies with ISO19794-2/ANSI378 international standard. It provides USB Type-A and Micro USB interfaces, supports Windows, Android, and Linux operating systems. We also provide complete source code SDK for further development. and integration. The fingerprint scanner system has two basic tasks: one is to obtain an image of the finger, and the other is to determine theWhether the ridges and troughs in the previous scans match the ridges and troughs in the previous scan images. HF4000 is widely used for registration and verification in different industries such as telecommunications, banking, e-health, logistics, etc. It can also be used in company employee time attendance, and fingerprint recognition time attendance is added to the access control system, which is more convenient for company management.