Transformable cursor controlling apparatus

A transformable cursor controlling apparatus, comprising:

• a pair of housings, having a first housing and a second housing, the first housing having a first joint surface, the second housing has a second joint surface opposite to the first joint surface;
• two sockets, disposed in the first housing and explored outside the first joint surface, wherein the two sockets are arranged symmetrically along a center of the first joint surface;
• an electrical connector, disposed in the second housing and protruded outside the second joint surface, the electrical connector apart from a center of the second joint surface with a predetermined distance and selectively plugged in one of the two sockets;
• and
• a cursor controlling module, disposed in one of the two housings for controlling a cursor of computer;
• wherein the second joint surface of the second housing is rotated 180 degrees along a central axle related to the first joint surface of the first housing, the electrical connector is plugged in the other socket.