Ringtone:
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Open TickTick on your Android device and go to Settings.
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Tap Sounds & Notifications > Ringtone and select a reminder Ringtone.
Annoying Alert:
If Annoying Alert is enabled, alerts will keep going for one minute and will be re-active after two minutes. This cycle won't stop until the notification has been handled.
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Open TickTick on your Android device and go to Settings.
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Tap Sounds & Notifications > then enable Annoying Alert.