Digital Persona U. are U. 4000B fingerprint reader
· Scan capture area: 14.6 mm (nom. width at center), 18.1 mm (nom. length)
· 8-bit grayscale (256 levels of gray)
· Reader size (approximate):79 mm x 49 mm x 19mm
· Compatible with USB 1.0, 1.1 and 2.0 (Full Speed) specifications