The U.are.U 4000 is a USB fingerprint sensor designed for use with DigitalPersona'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. On-board electronics calibrate the device and encrypt the image data before sending it over the USB interface. DigitalPersona products utilize optical fingerprint scanning technology for superior image quality and product reliability. The U.are.U 4000 Sensor and DigitalPersona recognition software have an unmatched ability to recognize even the most difficult fingerprints.