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In page Personal safety app:

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While most personal safety apps are offered as freeware, some are either distributed as a freemium app with paid features which can be unlocked through in-app purchases, supported through advertising, or marketed as paid applications. These include various features, including sending text messages, e-mails, IMs, or even Tweets to close friends (containing approximate location,[1]) or emitting a loud intermittent "shrill whistle" in the manner of a rape alarm.[1] Additional features include geofencing and preventive alerts.[citation needed] Some apps allow to customize the alert message sent and the ringtone that signals the reception of a new alert.