USB 2.0 Female to 3.5mm Male Audio Aux Plug Lead Headphone Jack Cable Wire Cord
3.5mm male: plug in the AUX input port of car stereo. - 1pc x 3.5mm AUX Cable Male to USB2.0 Female Converter. - USB 2.0 female: connect the USB flash drive, it can read the mp3 file form USB flash drive.