Airpod pro 2 case weird noise

Charging case sounds on AirPods Pro (2nd generation) are designed to play when the case is interacted with i.e. charging, when opened and when paired with a device.

1. To disable these sounds put on 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

Change settings for AirPods Pro (all generations) - Apple Support (NZ)