A mobile telephone charger capable of reproducing a promotional audio tune is provided comprising a housing, a power input connector attached to the housing for receiving an electrical power input, a power output connector attached to the housing for charging a mobile telephone responsive to the electrical power input, a power detector module for generating an enabling signal in response to detecting the electrical power input, an audio chip module responsive to the enabling signal for generating a predetermined audio signal, the predetermined audio signal corresponding to audio data stored in a computer readable medium disposed in the mobile telephone charger, and an audio transducer for generating an audio output in response to the predetermined audio signal.