Working principle is similar to the mouse ball is installed on the upper section to control the direction.When you spin the ball moves the pointer position themselves.The ball is larger than a mouse.
The principle is similar to the mouse The ball will be installed on the top to control the ball when it is rotated to move the pointer position that the ball is larger than a mouse.
The working principle is similar to the mouse. There will be installed in the upper ball to control the direction when spinning the ball is moving the position pointer itself ball is larger than the mouse more