It works great for programming microcontrollers such for , boarduino, Bareduino, , ESP8266, Mini minimOSD, and Atmel Xmega Xplained, mini pro, or any other that can be programmed over serialAfter installing the driver,This 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 board, , ESP8266, router and so on.Main chip: FT232BLPin Definition: ,,RXD,TXD,GND,VCCOutput VCC: 3.3V or 5VUSB interface: 2.0With 500MA self-recovery fuse reversed does protectionThe maximum speed: 921600bpsList of supported systemsWindows xp,7,8,10Ubuntu 11.10, kernel 3.0.0-19 OS X 10.3 to 10.8 (32 &64 bit) OS X 10.9 and above(64 bit)Instructions for use:(Example MCU)GND: Connect to GNDRXD: 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): Connect to MCU. (Signal Flow Direction: MCU. Less than Less than FT232 Less than Less than PC.): Connect to MCU. (Signal Flow: MCU. Greater than Greater than FT232 Greater than Greater than PC.)Material:plasticcolour:Black+goldPackage Contents:1 x Adapter Module1 x 5Pin Line(Note: Random color, don't accept the specified color.)Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.