An electrical connector assembly includes an electrical connector, a printed circuit board, and an electrical device. The electrical connector includes an insulative housing defining a tongue portion, a number of first contacts and second contacts, and a shielding shell. The tongue portion has an exposed part exposed from a front edge of the shielding shell to receive in a mating hole of the electrical device. The electrical device has an installing portion assembling the electrical connector. The electrical connector is mated with a mating connector through the mating hole, the exposed part of the tongue portion is received in the mating hole of electrical device, and the electrical connector except the exposed part is exposed our of the installing portion of the electrical device.