The joystick is a 'self-centering' analog-type. It is comprised of two 10KΩ potentiometers, one for up/down and another for left/right.
You can solder the potentiometer pins onto a custom breakout board if you so choose. We also offer our own Analog Mini Thumbstick PCB which will pair great with this little guy.
When fully assembled and functioning, the voltage will follow the motion of the thumbstick as it is moved around. When you release the thumbstick it will center itself. Great for robotics and other control interfaces!
Note: Breakout PCB is not included.
Adafruit Product Page: https://www.adafruit.com/products/2765