"Product DescriptionMaterial: electronic materialSize: 55*36.8mmQuantity: 3pcsPackage content: 3* finished blue board1.Designed for Arduino Nano V1.0 The item is a terminal expansion adapter, working very well for prototyping Arduino Nano projects2.Finished Product These boards are fully assembled. No soldering required. Size is about 55*36.8mm3.Nice Platform for Wiring Circuits It provided a nice platform for wiring circuits to Arduino Nano.It can connect a large number of digital lines to Arduino while maintaining the footprint of the original Nano4.Easy to Use You can use this adapter to easily hook up Arduino Nano to an outside world via hook up wires, and It can be used in conjunction with or in place of a breadboard5.Little Tips It lables for Arduino Nano version 1.0, however you can still use this adapter for the older version (just have to remember that A0-A7 are in the reverse order)."