A device communicating wirelessly using internal function components as antenna includes a case, and within the case a circuit board, a camera mechanism, and a wireless communication mechanism. The case includes an upper shell and a lower shell, the lower shell defining a slot is filled with an insulation strip. The camera mechanism and the wireless communication mechanism are arranged on the circuit board. The wireless communication mechanism faces the slot. The wireless communication mechanism and the camera mechanism cooperatively form an antenna. A wireless signal generated by the wireless communication mechanism is enhanced by the antenna and radiates outward from the slot.