Just like a joystick on game console. you can control x, y and z dimensions input by this joystick module. It can be considered as combination of potentiometers and one button. Data type of the x, y dimensions are analog input signals and z dimension is digital input signal. thus the x and y ports connect to analog pins of Sensor Shield, while z port connects to digital pin.

It can easily be connected to the Arduino Sensor Shield.

Specification:
3 axes: X, Y (potentiometers) and Z (button)
Potentiometers (X and Y): 2 x 5Kohm
Button: normally open (Z)
Strip Connection: 2.54mm
Dimensions: 37 x 32 x 25 mm
Weight: 15g

Connection mode:
1.GND
2.+5Vcc
3.vRX
4.vRY
5.SW