first surface 2011 and has a shape mating with the rj11 port 101 during the first terminal 201 is inserted into the rj11 port 101 the resilient arm 2011 a is pressed toward the first surface 2011 in response to restoring force of the resilient arm 2011 a the resilient arm 2011 a is sustained against the inner wall of the rj11 port 101 and thus the first terminal 201 is securely engaged with the rj11 port 101 that is the mechanism of coupling the first terminal 201 and the rj11 port 101 is substantially identical to the conventional mechanism of coupling a rj11 plug with a rj11 port in response to a pulling force applied on the mouse 300 the mouse 300 is disengaged from the second terminal 202 of the connector 200 and thus the mouse 300 will be detached from the notebook computer 100 in order to remove the connector 200 from the rj11 port 101 the resilient arm 2011 a should be pressed toward the first surface 2011 again under this circumstance the resilient arm 2011 a is not sustained against the inner wall of the rj11 port 101 and the first terminal 201 of the connector can be withdrawn from the rj11 port 101 as known the conventional rj11 plug has electrical contacts to be electrically connected to the corresponding electrical contacts inside the rj11 port since the connector 200 of the present invention is used for facilitating attaching the mouse 300 onto the notebook computer 100.