A computer system includes a wireless audio signal receiver module for receiving a wireless signal from a wireless transmitter separated from the computer system. The wireless audio signal receiving module includes a mode selector that is switchable between an audio mode and an instruction mode. When the mode selector is set to the audio mode, the wireless signal received by the receiver module is transmitted to a sound effect interface of the host device as audio signal and when the mode selector is set to the instruction mode, the wireless signal received by the receiver module is transmitted to a bus of the host device as instruction signal.

 
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