User manual

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and turn on the alarm before sleep, in order to ensure the best quality
during your rest.
Customize the Ringtones
ColorOS enables the user to customize ringtones. You can set different
ringtones to identify incoming calls, messages, and calendar
notifications. You may also customize the ringtones by importing alert
files on your phone or from online sources.
Go to "Settings" > "Sound & Vibration".