RT57318 TTL-232R-3V3-AJ Cable USB-Ttl Ser Conv 3V3 Aud Jack
The TTL-232R-3V3-AJ from FTDI is an USB to UART cable with +3.3V TTL level UART signals. It incorporates FTDI's FT232RQ USB to serial UART interface IC which handles all the USB signalling and protocols.