USB2.0 to TTL UART 5PIN Module Serial Converter CP2102 STC PRGMR with Metal case
Standard USB type A male and TTL 5pin connector. 5pins for 3.3V,TXD,RXD,GND & 5V. Byte receive buffer; 640 byte transmit buffer. Event character support Line break transmission. All handshaking and modem interface signals.