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The calendar uses the Oppo smartphone's default settings for sound output and haptic feedback. As with every app, the sound and vibration for the calendar can be customized.

Android 11 | ColorOS 11.0
Step 1: Tap on  Calendar
Step 2: Open the  Menu
Step 3: Tap on  Settings
Step 4: Tap on  General
Step 5: Tap on  Calendar notifications
Step 6: Set a  Ringtone  and turn on/off  Vibrate
  1. Tap on Calendar
  2. Open the Menu
  3. Tap on Settings
  4. Tap on General
  5. Tap on Calendar notifications
  6. Set a Ringtone and turn on/off Vibrate
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Oppo Instructions