An electrical connector assembly includes a cable connector having a cable therein and a jumper device retained on the cable. The jumper device includes an insulative base having a body portion mounted a jumper contact therein and a retaining portion engaging with the cable so as to keep the jumper device retaining on the cable. The jumper device is keeping retaining on the cable no matter whether the jumper device is in a work status, which is benefit for an operator to use.