3 in 1 set, the Nano IO Shield board, development board CH340 chip and , specially designed for Nano Version 3.0. This nano terminal adapter expansion board facilitates the connection between development board and the external environment. Can be used in combination with pegboard or instead of pegboard. No more soldering required. Nano I/O expansion board can be used for Nano Version 3.0. However, you can still use this adapter for the older version (you just need to note that A0-A7 is in reverse order). The development board with CH340 chip 5V 16MHz module is compatible. The Nano can be connected via a Mini USB B connection - so you can power circuit and plug-in system and your Nano with new programs from the IDE programming environment. Colour:Photo Color Material:Plastic + Metal Package Contents: 1 x Nano IO Shield board 1 x board CH340 chip. 1 x . 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.