In this article, we will provide a step-by-step guide on how to fix the volume syncing issue with your Space One headphones, ensuring you can get back to your audio enjoyment without any hitches.

1. For some Android phones, the headphone volume is not synchronized by default and users need to manually enter developer mode to adjust the volume synchronization settings. 

The method of entering developer mode varies depending on the phone model. For most models, you can enter developer mode by going to "Settings", finding the "Phone Version" option, and tapping it repeatedly until a prompt appears indicating that you have entered developer mode. Then, go to "Developer Options" to adjust the absolute volume setting. If this method does not work, you can search online for specific instructions on how to enter developer mode for your particular phone model.

2. For HarmonyOS phones, the headphone volume is not synchronized by default. 

You can directly enable volume synchronization in the settings window that appears when the Bluetooth connection name is displayed.

3. The media volume and call volume are independent of each other.

When adjusting the volume during a call, the media volume bar will not change. Similarly, adjusting the media volume bar will not affect the call volume. This does not indicate that the headphone volume is not synchronized with the device.

If you encounter any other issues or your issue has not been resolved, please contact us for further assistance.