... left side , the center is a stick for cursor moving control , and the left and right are two rubber buttons to ... left side , the center is a disc for cursor moving control .The diameter of top is 19mm ,, and bottom is 23mm ... GPS, PDA, Mini notebook , Wireless KB's pointing device , Game..… using GS9501 Y type gyro stick or GS9500 GS9501 Gyro Stick soldering Device