An cable assembly includes an external cover; two printed circuit boards accommodated in the external cover; a cable including a plurality of wires, a metallic braiding enclosing the wires and an insulative jacket enclosing the metallic braiding, an axial slit defined in the metallic braiding and the insulative jacket of a front segment of the cable for exposing the corresponding wires outside, the corresponding wires separated into two groups of wires respectively soldered to the two printed circuit boards; an outer shielding layer enclosing the axial slit; and a shrinkable tube mounted to the outer shielding layer.