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警報器能在女子單獨回家的時候使用，當身旁有不明人士出現，而自己正好在滑手機，便可開啟警報器app，按下按鈕，並且把音量調到最大，即可引發注意的眼光，嚇走不明人士

Alarm when the womancango home alone use, when unknown persons appeared beside, whilehejust slide the phone, you can turn the alarm app, press thebutton,and the volume to maximum, you can trigger note vision, toscareaway by unknown persons