Description:   Product description:   Bluetooth car MP3 player, with built-in FM transmitter, MP3 decoder and stereo Bluetooth wireless transmission chip, can play the audio or songs in TF card, U disk and mobile phone through your car stereo, without modifying your car, so that you can enjoy music while driving and use hands-free mobile phone to talk.         "Product features"   Play songs in USB flash drive and TF card,   Through Bluetooth A2DP technology, the audio and stereo music in the mobile phone can be transmitted to the car stereo.   Support HFP/HSP,OPP,A2DP/AVRCP,PBAP Bluetooth protocol   FM transmission frequency range: 87．5～108.0Mhz   Bluetooth handsfree function with DSP echo cancellation function   USB interface can charge all kinds of mobile phones, 1A charging current   Wide voltage supply 12V-24V, suitable for all kinds of voltage vehicles,      Function:   Answer/hang up the phone   Connect the mobile music software and navigation software on the car.   The previous song/next song   Play/pause   Adjust the sound volume.   Call back   Support USB flash drive and TF card playback   Two USB interfaces support charging of two USB devices.   Support short-circuit overload and overcharge protection      How to use:      1. Insert the device to car cigarette lighter outlet, start the car for Power ON;      2. Tune the car radio and device to a same blank channel, such as if car radio is 87.5MHz, the device must be 87.5MHz to, press [CH] to adjust frequency;      3. Turn on the Bluetooth of phone, search "BT-Car" and Pair with it, pair successfully, play phone music, sounds will comes out from car speaker         TF/USB Flash Music playing:       If insert the TF card or USB flash drive, it will automatically play USB music;      Long press [Answer] button to swtich music mode between USB/TF/Bluetooth modes          Bluetooth mode:      When listening to the song:      Stand-alone [Previous/Next], switch songs      Stand-alone [phone], play/pause songs      Long press [Previous/Next] to increase or decrease the sound.      When calling:      Press the short [answer] button: answer/hang up the phone;      Press and hold the [Answer] button to reject the call.      Double-click the [Answer] button to redial the last phone number.   Specifications:   Specifications:   Rated voltage-12 ~ 24v   Work rate-0.5w   Working temperature-10 ~ 70 degrees   Working temperature-0 ~ 90%   Frequency-20 Hz ~ 15 khz   Audio format-MP3   Support Bluetooth protocol-HFP/HSP, OPP, A2DP/AVRCP, PBAP   Signal to noise ratio-68db   Bluetooth version-V3.0 EDR   Bluetooth sound processing-sound body sound-A2DP (Advanced audio distribution profile)   Bluetooth transmission distance-10 ~ 15m   FM transmission frequency-87.5 ~ 108.