FT232RL USB to TTL.RXD/TXD transceiver communication indicator.Pin definition: DTR, RXD, TX, VCC, CTS, GND.Module dimensions: 36mm (Length) * 18mm (Width) An inexpensive way to add USB capability to Arduino or other microcontrollers. Use it to give your own board Arduino USB capability to upload or download sketches. The FTDI FT232RL is an RS232 to USB converter and is suitable for direct use on a microcontroller. Specifications: No driver required. Support 3.3V and 5V Chipset: FT232RL Definition of PIN code: RXD, TX, VCC, CTS, DTR, GNDPas: 2.54mmInterface: Mini USB Module size: 36mm x 18mm This USB to TTL serial adapter is ideal for many uses including: programming microprocessors such as ARM, AVR etc, working with computer hardware such as routers and switches, serial communication with many devices such than GPS devices or serial terminals on devices like the Raspberry Pi. Package Included: 4x FTDI USB to Serial TTL Adapter Note: The data are all manual measurement, please allow 1 error - 3cm, due to the light and display difference, there will be some color difference, depending on the physical object received.