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 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound & vibration
Step 3:  Tap on  Additional settings
Step 4:  Enable or disable  Screen locking sounds
  1. Open the Settings
  2. Tap on Sound & vibration
  3. Tap on Additional settings
  4. Enable or disable Screen locking sounds

Xiaomi Instructions
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