Extreme Notifications is a setting that makes your notifications for messages very loud and persistant. If you receive a message while in Extreme Notifications mode, you will receive a very loud notification chirp that repeats every 15 seconds.
The notifications will stop when one of the following has happened: you checked your message, 5 minutes has passed, or you turn the mode off.
To turn on Extreme Notifications for a specific chat, please perform the following steps:
Select the chat that you wish to enable Extreme Notifications for > Go to the Chat Menu > Select More Options > Tap Notifications > Set Notification Preference.
To turn on Extreme Notifications for a specific chat, tap on the menu icon while in a chat > Tap Notifications > Select Extreme Notifications > OK.
To turn Extreme Notifications globally (for every message you receive), navigate to the main menu > Tap "Audio and Notifications" > Tap "Notifications" > Select Extreme Notifications > OK.