You can easily extend the existing Aux 3.5mm cable with an Auxiliary Stereo Audio Extension cord. 3.5mm AUX Extension Cable. AWG (Gauge) : 3.5mm 1/8" 3-Pole AUX Extension Cable Stereo Audio. Simply connect the female end of the 3.5mm (1/8") stereo audio extension cable to an existing 3.5mm cable.
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