After your smartphone is connected to the CarPlay Smart Box, but there is no sound. How to solve this problem?

When you encounter this kind of problem, please don't worry.There are 3 main reasons for this problem, please follow the steps below to solve:

Wired connection is more stable for Android auto. The wireless connection steps are as follows: Open Android auto app. Click settings. Click developer settings. Select "Add wireless projection to settings".

1. Main Menu - Press Car Brand Icon 2. Language - 11 Different Languages For Option. 3. Information - CarPlay Smart Box System Version. - 4. Display - Setting For Screen Brightness 5. Volume - Setting For System Master Volume. 6.

1. Switch to CarPlay Smart Box System Main menu. 2. Plug USB flash to CarPlay Smart Box Kit USB Cable. 3.The USB icon will be light up. 4. Scan images, Play music and HD videos. 5. Playing HD Videos.

1. Go to setup, and select "Smart phone". 2. Select "Android device". 3. Select "Auto Link". 4. Connect Type-C cable with CarPlay Smart Box kit USB cable. 5. Connect with your phone. 6.

1. Download Android Auto App at your Android smart phone. 2. Go to Setup, select "Smart phone". 3.Select "Android device". 4. Select "Android Auto". 5. Connect Type-C cable with CarPlay Smart Box Kit USB cable. 6.

All jobs done. Enjoying...

1.Go to setup, select "Smart phone". 2. Apple Device. 3.iOS Mirror. 4.Connect Type-C cable with Smart Box Kit USB cable. 5. Then Connect with iPhone. 6. Your iPhone will get a trust request. Click and accept it. Enjoy it!