This is a terminal adapter for the Arduino Nano. It lables for Arduino Nano version 3.0, however you can still use this adapter for the older version (just have to remember that A0-A7 are in the reverse order). You can use this adapter to easily hook up Arduino Nano to an outside world via hook up wires.
1x Terminal Adapter board for the Arduino Nano V3.0 AVR ATMEGA328P-AU Module
Nano Terminal Adapter for the Arduino Nano V3.0 AVR ATMEGA328P-AU Module Board