The OnePlus smartphone's alarm clock can automatically mute itself after a set alarm time, for example to avoid waking the entire neighborhood if it is overheard.

The following options are available for this:

Android 10 (OxygenOS 10.0)
Step 1:  Open the  Clock app
Step 2:  Open the  Settings
Step 3:  Tap on  Silence after
Step 4:  Choose an  option
  1. Open the Clock app
  2. Open the Settings
  3. Tap on Silence after
  4. Choose an option

OnePlus Instructions
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