GRANDnavi Double Din Multimedia Player Auto Radio Multimedia Player Touch Screen Car Stereo MP5 players

Q1: What's different about the BT, BTC, CA,PRO series in our product listing？ 1> BT,BTC,CA series is wince system，No GPS , No Wifi , No storage， 2> CA series have CarPlay and Androidauto function. 3> PRO series is Android system，have RAM & ROM , have GPS and Wifi function. Q2.Why the car radio can't turn on ? 1>Please check the Voltage of car radio :DC 12V 2>When you test this car radio,you can combine the red and yellow wires and connect them to the positive side of the power supply.Black line to negative power supply. 3>Replace the same type of insurance to test the car radio. Note:Mustt use our power cables to connect the radio,it is can not insert the original car plug directly into our machine. Q3.Why the car radio will show "No Signal" when we reversing? 1>Please check if the camera's wire is properly connected to the car radio. 2>Note:The video port of rear camera must insert the "CAMIN" port of car radio. Q4.Why does the camera display "!" and "Can't watch video while driving" when I use USB to watch videos? 1> Please turn off the "Video Warning" function in the settings,then will be OK. Q6.Why haven't sound in car radio when playing the music? 1>When you are not using our original audio cable, please check if your audio cable is suitable for our radio. 2>Please check if there is any collision between the lines. 3.>If the line is connected, there will be no sound when the speaker cable touches the speaker cable.There is no sound too when the power cord touches the speaker cable. 4>If no use,please use a single speaker to connect a group of audio cables to test the car radio. The four speaker cables are connected separately to see if there is any sound. Q7.Why can't search FM? 1> No radio antenna inserted. 2> Please check if the radio antenna is plugged in. Please insert more antennas several times to make it well contacted. 3>The signal of your location is not good. Please go to a better place to test again. 4>The radio antenna on the car is broken/no effect; please replace the radio antenna and test again;