A RJ plug connector includes a plug body with a base section and a plurality of conductive contacts received in the base section. The base section defines a front mating face and a rear cavity. A latch with a lead-in is form on the top face to locking with a socket connector. The RJ connector further defines an optical fiber module which is incorporated with the latch adjacent to the lead-in and has a coupling interface at a front face of the latch. It not only can insure large capacity and high rate data transmission, but also can extend data transmission distance without loss.