what's in the box: ·1* vehicle MP3 ·1* charging line ·1* remote control ·1* instructions Product description: ·The product is specially designed as Car Bluetooth FM transmitter. ·It adopts advanced capability and professional Bluetooth module, ·Built in WAV/MP3/WMA decode chip, it can decode music files which ·You download to TF card and USB flash, and then transit to car audio ·Through FM wireless transmitter. If your mobile phone with blue tooth function, ·It can convert to hand free automatically when there is a call. And after ·Communication with caller it can convert back to play music automatically. ·Also it can using wireless transmit MP3 file music from your mobile phone to ·Car radio, no need to change any original device of your car. You may enjoy music ·On the way during driving and talk over the call in hand free, so entertainment ·And security along with you on the way. ·Play music stored inside cell phone ·The device supports A2DP function, can play music stored in cell phone, transmit the music to car audio via Bluetooth handsfree FM transmitter, to arrive higher quality sound effects. How To Use? ·Plug the FM transmitter into your car cigarette lighter socket for power. ·Turn your radio to an unused FM frequency, then match this FM transmitter to the same frequency. FM channels 87.5 MHz - 108.0 MHz. ·Insert a Micro USB Flash Driver or pair this Bluetooth FM transmitter with your digital device to enjoy music playback or hands-free conversation.