An electrical connector includes a housing having an accommodation chamber defined therein and multiple holes cut through one side of the housing, and a wireless transmission module accommodated in the accommodation chamber, the wireless transmission module having a wireless network card and an adapter module electrically connected together for converting and transmitting wireless signals, the adapter module having a set of transmit pins extending out of the holes of the housing for connection to an external electronic device electrically for enabling wireless signals received by the wireless network card to be transmitted to the external electronic device.