GT511C3 Capacitive Finger Print Module is a high-performance fingerprint scanner. Which is useful for to access control, security, identification, and convenience. This optical sensor module is designed for easy integration into applications with serial interface (UART). We need two wires are for TX and RX and two wires for power supply (5V). It has ultra-thin optical sensor and high-accuracy & high-speed fingerprint identification technology. Works well with dry, moist or rough fingerprints. 200 fingerprints storage and easy one-touch enrollment.