Description:Question: There is no sound from the speaker? A: Please check whether the machine speaker cable is connected correct. Please strictly follow the car speaker connection Match the interface definition in the manual or body label. otherwise, The machine's amplifier chip may be damaged. Q: Don't remember the last radio station and music you set? A: Please check whether the red and yellow wires are connected reversely. Make sure the yellow wire (B+) is always connected to the car cable 12V voltage, red wire (ACC) connected to the car key cable. Q: Unable to read or play SD, USB music and videos? A: Please use an 8G or 16G memory card or USB flash drive. Some Mass storage devices may not be supported. Q: Bluetooth connection fails, or some functions are abnormal After connecting? A: Please use your mobile phone to search for Bluetooth devices Machine with name "CAR BT" or "CAR KIT"; Delete Devices that are paired with but not connected to the phone. Q: It cannot be opened. Is the screen display normal? A: Please check whether the machine power cord is connected Incorrect or incorrect. The normal wiring is as follows: Yellow Wire (B+) connects to the always active 12V cable, red wire (ACC) key cable connected to the vehicle. Judgment : The key line is as follows: the key line is 12V when the car is started It is 0V when closed; black is connected to the negative pole; check whether it is burned out Fuses in electrical sockets in cars and machines. The above involves disassembly and circuit problems, please Do it professionally to avoid damaging your car. Colour:As Shown Material:ABS Package Contents: 1 * Player 2 * Power cord 1 * Remote control 1 * English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.