Hey there giofurlanetto,
Thanks for reaching out to the Apple Support Communities. To get started, the sound you're hearing may be caused by a few different scenarios. For example, this can occur when your charging case connects to your iPhone, charges, or when playing a sound to locate your AirPods.
If you'd like to disable this feature, you can do so by going through the steps below from the following resource: Change settings for AirPods Pro (all generations) - Apple Support
Turn off charging case sounds on AirPods Pro (2nd generation)
Your AirPods Pro (2nd generation) charging case plays a sound when it pairs, charges, and more. You can turn off these sounds.
1. Wear your AirPods, and make sure they’re connected to your device.
2. Do one of the following:
- On iPhone, iPad, or iPod touch: Go to Settings
, tap the name of your AirPods near the top of the screen, then turn Enable Charging Case Sounds on or off.
- On Mac: Choose Apple menu
> System Settings, click the name of your AirPods in the sidebar (you may need to scroll down), then turn “Enable charging case sounds” on or off
Let us know if that's able to help.
Have a great day!