It works great for programming microcontrollers such for Arduino, boarduino, Bareduino, Raspberry Pi, ESP8266, Mini minimOSD, and Atmel Xmega Xplained, Atmega328 mini pro, or any other that can be programmed over serial After installing the driver,This FTDI TTL adapter will simulate a COM port on your computer/laptop. Through this simulated COM port, you can communicate or program with various hardware or MCUs, such for Arduino board, Raspberry Pi, ESP8266, router and so on. Main chip: FTDI FT232BL Pin Definition: CTS,RTS,RXD,TXD,GND,VCC Output VCC: 3.3V or 5V USB interface: 2.0 With 500MA self-recovery fuse reversed does protection The maximum speed: 921600bps List of supported systems Windows xp,7,8,10 Ubuntu 11.10, kernel 3.0.0-19 Mac OS X 10.3 to 10.8 (32 &64 bit) Mac OS X 10.9 and above(64 bit) Instructions for use:(Example MCU) GND: Connect to GND RXD: Connect to MCU.TX (Signal Flow: MCU.TX Greater than Greater than FT232 Greater than Greater than PC.RX) TXD: Connect to MCU.RX (Signal Flow: MCU.RX Less than Less than FT232 Less than Less than PC.TX) 3V3/5V: Output 3.3V or 5V (module powered by USB, jumper cap :to 3.3V or 5V) RTS: Connect to MCU.CTS (Signal Flow Direction: MCU.CTS Less than Less than FT232 Less than Less than PC.RTS) CTS: Connect to MCU.RTS (Signal Flow: MCU.RTS Greater than Greater than FT232 Greater than Greater than PC.CTS) Material:plastic colour:Black+gold Package Contents: 4 x Adapter Module 4 x 5Pin Dupont Line(Note: Random color, don't accept the specified color.)