The invention relates to a
mobile phone protective cover with a frequency-modulated (FM)
signal emission module and a
system thereof, which relate to the field of
mobile phone protective cover technologies and third-party applications and solve the problem of technical deficiencies for connections between mobile phones and vehicle-mounted audios. The
mobile phone protective cover mainly comprises a left side frame, a right side frame, an upper side frame and a lower side frame. The mobile phone protective cover is characterized in that: the mobile phone protective cover further comprises the FM
signal emission module which is connected with a plug connector and is used for converting
voice frequency signals of a mobile phone into FM signals; and the FM
signal emission module comprises an FM emission unit and a
control unit, wherein the FM emission unit is used for being connected with the audio output end of the mobile phone, converting the
voice frequency signals of the mobile phone into the FM signals and transmitting the FM signals to an FM signal receiving device, and the
control unit is used for being connected with the
control signal output end of the mobile phone and for regulating the frequency of the FM signals of the FM emission unit according to control signals outputted by the mobile phone. A power source is not needed to be individually arranged, thus the volume of the mobile phone protective cover with the FM signal emission module is reduced; the emission frequency of the FM signals is freely controlled by a regulation and control program in the mobile phone, thus the mobile phone protective cover with the FM signal emission module has strong
controllability; and connecting wires are not needed, so that the mobile phone protective cover with the FM signal emission module has a simplified structure and is convenient to use.