Yomikoo Car Kit MP3 Player Bluetooth LCD FM Transmitter Modulator USB SD Remote Aux in Adapter 2A fit for Audi BMW Toyota Honda Jeep Nissa Mazda Cadillac Fort Fit For All Cars AUX Adapter Only USB2 support U disk play/charging,USB1 only can be used as charging port. This product may hot or suspend/resume when start the car,it is normal phenomenon. If the indicator light not show,please check whether the insurance tube is damaged,or whether the power supply voltage within the rated working voltage range,