►Compatibility：PL2303HX is housed in USB 2.0 type A male terminal for wider compatibility and supports reliable data transfer rates. | ►Connect：GND- not to connect on the pin with voltage, RX and TX not to connect the VCC pin.Pin can be distinguished by different colors, Red: +5V, Black: GND, Green: TXD, White: RXD. | ►Configurability：For 3.3 V logic level serial communication (RX,TX, VCC and GND);Standard COM port; for debugging, boot-loading, programming, etc. | ►Application：Used for USB to TTL electronic projects, easy to connects devices with 3.3 V logic level UART signals interface to a laptop via USB port，Industrial Control. | ►Powerful：USB to TTL serial cable 3.3V (4 way output flying leads ) provides access to UART (transmit) Tx, (receive) Rx, VCC (5V) and GND(ground), RX and TX at 3V3 logic level