The FT4232HL performance is very suitable for high demand industrial applications, achieving simultaneous communication through a single USB expansion of four UART serial ports, independent and not affecting each other. The computer displays four COM ports and provides a communication rate limit of up to 12Mbps. ^^ Fireproof and flame retardant, convenient for maintenance, high temperature resistance, and safe quality ^^ DC 5.5 - 2.1 interface can provide high current to power external devices ^^ VCC, TX, and RX can all be switched to 5V/ 3.3 / 2.5V / 1.8V ^^ The four serial ports use the XH 2.54 interface, and all four UARTs have TX/RX indicator lights to display status.