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 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 analog Pin with power output and GND6 PWM Pin1 Servo power input5 I2C expansion PinAREF output3.3V output