A connector defining a receiving opening for receiving a corresponding plug, includes an insulative housing, a plurality of contacts attached to the insulative housing, and a grounding tab. The contacts include a pair of differential signal contacts. Each differential signal contact has a first retaining portion retained in the insulative housing, a first contact portion extending to the receiving opening for contacting with the corresponding plug and a first tail portion for connecting with a circuit board. The first tail portions of the differential signal contacts define a distance which is larger than that of the corresponding first contact portions. The grounding tab is retained between the first tail portions of the pair of differential signal contacts.