An electrical connector comprises an insulative housing and a plurality of first conductive terminals retained in the insulative housing. The insulative housing defines a mating frame running through a front face thereof. An L-shaped mating tongue extends forwardly in the mating frame. The mating frame has two opposite inner surfaces facing to the mating tongue and spaced from the mating tongue. The first conductive terminal each includes a contacting portion arranged on a mating face of the mating tongue and a connecting portion extending out of the insulative housing. The electrical connector includes second conductive terminals disposed on both inner surface of the mating frame. The second conductive terminals are used for different-voltage power transmission. Therefore, the electrical connector not only meets the specification of SATA connector, but also provides the function of signal transmission and different-voltage power transmission.