The present invention is to provide a connector, which includes a casing; a first signal transmitting unit having a portion protruded from the casing and another portion extended into the casing; a second signal transmitting unit disposed in the casing and electrically coupled to the first signal transmitting unit; a third signal transmitting unit movably installed in the casing and having a portion insulatedly coupled to the second signal transmitting unit. If a portion of the third signal transmitting unit is pushed, the second signal transmitting unit will electrically disconnect the first signal transmitting unit, and another portion of the third signal transmitting unit will electrically connect the second signal transmitting unit.