The first thing one see about the PS Move is the
ball on the top of it. It is actually important to the
motion detection, as the PS Eye identify the ball to
recognize movements. It possess three LEDs (Red,
blue and green), which make the orb change to a
different color, thus easing the detection made by
the PS Eye. Similar to the Wii controller, PS move
is equipped with a three axis accelerometer and a
gyroscope to determine its position. In addition, a
magnetometer, which measure the Earth’s magnetic
field and is used to calibrate inertia sensors on the
controller.
Its performance is better than the Wii remote,
however it has not much software support to make
it a huge commercial success yet.