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The Xiaomi smartphone emits a short acoustic signal that is similar to a lock and unlock, lock and unlock. The lock screen sound can be (de)activated if desired.

Android 11 | MIUI 12.0
Step 1: Tap on  Settings
Step 2: Tap on  Sound & vibration
Step 3: Tap on  Additional settings
Step 4: Enable or disable  Screen locking sounds
  1. Tap on Settings
  2. Tap on Sound & vibration
  3. Tap on Additional settings
  4. Enable or disable Screen locking sounds
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Xiaomi Instructions