Hi,

We're sorry that you're having a problem with the sound.
Depending on the smartphone app or computer application (for which HFP (Hands-free Profile)/HSP (Headset Profile)
is required), you may only hear the voice from one headset unit.
1-Charge the earbuds.
2-Reset (restart) the playback device.
As the playback device may not work temporarily, switch the device off and on again once.
3-Clear the Bluetooth device information of your playback device.
4-If the earphones are connected to a computer, check the following settings:
For Microsoft® Windows® 11 operating system:
-Open the Start menu and select Settings.
-Select System.
-Select Sound.
- Scroll down to the "Advanced" menu and select "More sound settings".
- On the "Playback" tab, select "Headphones" and click "Set as default device".
For Windows® 10:
- On the right side of the computer screen, right-click on the speaker icon.
-Select "Open sound settings" and then
-Select "Sound control panel".
-Select the "Playback" tab to display the device list.
-Select the headset labelled "Handsfree" and click on "Set as default device".
-Select OK to close the settings screen.
5-Initialise the earbuds.
If the problem persists, we recommend that you contact us directly. You can find the contact details on our support page.

Sony Europe