Compact Design: The mini port design makes it portable and easy to integrate into any setup without taking up much space.Easy Installation: Features a plug-and-play interface that simplifies the setup process, allowing for immediate use upon connection without the need for complicated drivers. 1. Short-circuit TXD and RXD of USBTTLPLUS (TXD-RXD) 2. If you need to test the hardware flow control wiring, please connect as follows: CTS-RTS 3. Use USB cable to connect the module to the computer, open the serial port debugging assistant, and select the corresponding port number 4. Send data to USB TTL PLUS through the serial port debugging assistant, and observe whether the receiving window of the serial port assistant receives the same data as the sending end Colour:As Shown Material:PCB Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 * FT232RL USB TTL PLUS Serial 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.