This is 3.3V/5V FPM10A Fingerprint Reader Sensor Module Optical Fingerprint Reader Sensor Module For Arduino Locks Serial Communication Interface Item Description: Supply voltage: DC 3.6 ~ 6.0 V / 3.3 V Supply current: < 120 mA Peak current: < 140mA Fingerprint image time: < 1.0 seconds Window size: 14 ╳ 18 mm Matching mode: Match mode (1 : 1) Search mode: (1 : N) Signature file: 256 bytes Template files: 512 bytes Storage capacity: max 200 Safety level: Five (from low to high: 1, 2, 3, 4, 5) False accept rate (FAR): < 0.001% (security level 3) False reject rate (FRR): < 1.0% (security level 3) Search time: < 1.0 seconds (1:500, mean) PC interface: UART (TTL logic level) or USB2.0 / USB1.1 Communication baud rate (UART): (9600 ╳ N) bps where N = 1 ~ 12 (default value N = 6, ie 57600bps) Working environment: Temperature: -20 ℃ – 50 ℃ Relative Humidity: 40% RH-85% RH (non-condensing) Storage environment: Temperature: -40 ℃ – 85 ℃ Relative humidity: < 85% H (non-condensing) Dimensions (L ╳ W ╳ H): Split: Fingerprint sensor: 56 ╳ 20 ╳ 21.5 mm -One: 56 ╳ 20 ╳ 21.5 mm Hardware connection: Serial communication interface module, with 3.3 V or 5 V power micro-controller. Communication: Module data transmission feet (2 Food TD) connected to the data bit machine receiving end (RXD). Data receiver module feet (3 feet RD) connected to the data sender bit machine (TXD). For the RS-232 level (for example: PC machine) for PC communication, increase the level conversion between the module and the host computer Circuitry (e.g.: MAX232 circuit)