This is the USB TO SERIAL UART Rapid Board using the FTDI - FT232RNL chip. It allows you to switch between 5V and 3.3V power systems by adjusting a jumper, making it easier to connect devices for data transmission. The Rapid Board has two yellow LEDs that blink during data transmission and reception, helping you easily identify the data transfer status. We use a classic standard USB-A connector, which can be conveniently plugged into computer devices for development and testing.