For Arduino Nano, IO Expansion Shield is specifically designed to facilitate an easy connection between Arduino Nano and many other devices. In essence, it expands the Nano controller capabilities to link those devices in a simple and trouble-free manner. It is a perfect companion of Nano Breadboard and compatible with both Nano v2.x and v3.x.

This expansion shield provides:

14 I/O Pin (servo type with GND, power and signal)
8 analogue Pin with power output and GND
6 PWM Pin
1 Servo power input
5 I2C expansion Pin
AREF output