A system comprising a mobile terminal and a vehicle key module, the mobile terminal comprising: a terminal body; antennas (104, 105) provided in the terminal body; and a socket configured to insertably receive the vehicle key module, wherein the socket is arranged between the antennas (104, 105) and a printed circuit board, PCB, provided in the terminal body, such that the inserted vehicle key module is electrically connected directly to the antennas (104, 105) without passing through the printed circuit board, wherein the terminal body includes a detachable rear cover, wherein the antennas (104, 105) are embedded in the rear cover, wherein the rear cover is provided with antenna pins (106, 107) extending from the antennas (104, 105), wherein the antenna pins (106, 107) are configured to directly connect to pins (206, 207) of the vehicle key module, wherein the vehicle key module comprises: first pins connected to pins extending from a low frequency antenna and second pins connected to pins extending from an ultra high frequency antenna, and third pins connected to pins extending from the printed circuit board, wherein the first pins and the second pins are provided on one surface of the vehicle key module facing the pins (106, 107) extending from the antennas (104, 105) embedded in the rear cover when the vehicle key module is inserted into the socket, and wherein the third pins are provided on another surface opposite to the one surface of the vehicle key module and facing the printed circuit board when the vehicle key module is inserted into the socket. a terminal body; antennas (104, 105) provided in the terminal body; and a socket configured to insertably receive the vehicle key module, wherein the socket is arranged between the antennas (104, 105) and a printed circuit board, PCB, provided in the terminal body, such that the inserted vehicle key module is electrically connected directly to the antennas (104, 105) without passing through the printed circuit board, wherein the terminal body includes a detachable rear cover, wherein the antennas (104, 105) are embedded in the rear cover, wherein the rear cover is provided with antenna pins (106, 107) extending from the antennas (104, 105), wherein the antenna pins (106, 107) are configured to directly connect to pins (206, 207) of the vehicle key module, wherein the vehicle key module comprises: first pins connected to pins extending from a low frequency antenna and second pins connected to pins extending from an ultra high frequency antenna, and third pins connected to pins extending from the printed circuit board, first pins connected to pins extending from a low frequency antenna and second pins connected to pins extending from an ultra high frequency antenna, and third pins connected to pins extending from the printed circuit board, wherein the first pins and the second pins are provided on one surface of the vehicle key module facing the pins (106, 107) extending from the antennas (104, 105) embedded in the rear cover when the vehicle key module is inserted into the socket, and wherein the third pins are provided on another surface opposite to the one surface of the vehicle key module and facing the printed circuit board when the vehicle key module is inserted into the socket.