The DF500 is the smallest and most compact four fingers fingerprint scanner on the market. The device has the function of prompting the user which finger to scan and it is convenient and easy for users to operate; Simple interface information; Automatic segmentation and processing of finger images; Automatic real-time detection of image quality and feedback to the indicator; The image quality meets the certification requirements of the United States FBI on the automatic fingerprint identification system for image quality, and is compatible with the GA certification standards for live fingerprint scan of the Ministry of Public Security.