USB to TTL serial adapter (with 4 pin 0.1" pitch female header socket) connects devices with 3.3 V logic level UART signals interface to a laptop via USB port A genuine PL2303TA chip module is housed in USB 2.0 type A male terminal for wider compatibility and supports reliable data transfer rates 6 feet USB to serial cable (4 way output flying leads ) provides access to UART (transmit) Tx, (receive) Rx, VCC (5V) and GND