The present invention discloses a mobile device including a motor module, a heat dissipation module, a vibration module and an electric brush module. The motor module has a rotating shaft driven by the motor module and two ends of which stick out from the motor module. The heat dissipation module includes a fan unit fixed on one end of the rotating shaft. The vibration module includes a vibration cam and an electromagnetic coil disposed on the vibration cam. The vibration cam is loosely fitted and disposed on the other end of the rotating shaft. The electric brush module is disposed inside the mobile device corresponding to the electromagnetic coil. When electrified, the electric brush module excites the electromagnetic coil generating a magnetic force to adhere and rotate with the rotating shaft synchronously. Herewith the effects of effective heat dissipation and saving interior space of the mobile device are achieved.