The Brother DS-640 Compact Mobile Document & ID Card Scanner is a portable scanner with a grayscale depth of 8 bit and color depth of 48 bit. It features a maximum resolution of 600 x 600 DPI and utilizes Contact Image Sensor (CIS) technology for scanning. With USB 3.0 connectivity, this Brother scanner is designed for on-the-go scanning of documents and ID cards with high-quality results. Its compact size and efficient performance make it a convenient choice for professionals needing a reliable scanning solution.