Product Description: The U.are.U 4000B is a USB fingerprint sensor designed for use with Digital Persona¡¯s U.are.U applications and developer tools. The user simply places his/her finger on the glowing sensor window, and the device quickly and automatically captures the fingerprint image. Onboard electronics calibrate the device and encrypt the image data before sending it over the USB interface. The U.are.U 4000B Sensor and Digital Persona recognition software have an unmatched ability to recognize even the most difficult fingerprints. Applications: Desktop PC security, Mobile PCs, Custom applications, Home and Office Use Features: Small form factor Excellent image quality Encrypted image data Latent print rejection Counterfeit image rejection Rotation invariant Rugged Works well with dry, moist, or rough fingerprints Challenge response link Compatible with all U.are.U applications Drivers support Windows 98, Me, NT 4.0, 2000, XP  Key Specifications: Pixel resolution: 512 dpi (average x,y over the field) Image capture area: 14.6 mm (nominal width at center)                               18.1 mm (nominal length)                               8-bit grayscale (256 levels of gray) Sensor size: approx. 79 mm x 49mm x 19 mm Compatible with USB specifications 1.0, 1.1, 2.0