TTL-232R-3V3-AJ is a USB to UART cable, + 3.3V TTL level UART signal. It incorporates FTDI's FT232RL USB to Serial UART interface chip, which handles all USB signals and protocols. This cable provides a quick and easy way to connect a TTL-level serial interface to USB. It contains a small internal electronic circuit board, using the FT232R encapsulated in a USB connector on one end of the cable. The other end of the cable is a 3.5 mm audio jack (AJ) connector. The USB end of the cable is used for USB power and USB 2.0 full speed compatibility.

Connect directly to a microcontroller UART or I/O pins.
UHCI / OHCI / EHCI host controller compatible.
3 way outputs provide Tx, Rx and GND
Data transfer rates from 300 baud to 3 Mbaud at TTL levels.
Fully assisted X-On / X-Off software handshaking Internal EEPROM with user writeable area.
USB 2.0 Full Speed compatible.
Support for FT232R FTDI Chip-ID feature for improved security.
TTL-232R Converter Cable provides a USB to TTL Serial interface with various end connectors.
On board FT232RL provides single chip USB to asynchronous serial data transfer interface.
Entire USB protocol handled by the electronics in the cable USB.
Low USB bandwidth consumption.
-40°C to +85°C operating temperature range.