The LC234X module is a low cost USB to UART bridge using the FTDI FT234XD to transfer data at up to 3M Baud. Ideal for programming Arduino Pro, ESP modules etc., the pinout follows the industry standard FTDI TTL cable interface. In addition to the 4 UART signals (RXD, TXD, RTS, CTS) there is also the option to output 5V power to external hardware. The interface IO levels may be set to either 3.3V or 5V by an on-board jumper – no soldering / de-soldering required. In 5V mode, outputs are rail to rail for maximum reliability.