UART output interface definition: 5V, RX, TX, GND, reserved IC+ID dual-frequency card reader module, it integrates high-performance card reader RF circuit and antenna, Uart data output protocol. Voltage DC3.3-5.5V Current 50mA (maximum current), standby current: 40mA Supports reading 125kHZ and 13.56MHZ cards Interface UART Small size 47mm (length) x 26mm (width) x 5mm (thickness) (including antenna) for easy embedding Industrial-grade products can work normally in environments from -40 to +85 degrees (Different batches may have different printed characters, but it does not affect the use) Applications: l Attendance fingerprint card reader module l Access control intercom card reader module Color: As Shown Material: PCB Package Contents: 2 * Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.