This can be anyone in the user's contacts book, and they don't need to have the app installed.

这个“同伴可以是用户通讯录里的任何一个人，而他们不必安装此应用。

The 'companion' can then track the phone's GPS to see where their loved one is at any time, while the app will periodically show a button on the user's home screen asking 'Are you OK?'

然后这位“同伴就可以跟踪手机的GPS随时了解他们爱的人所在的位置，而同时应用会定时在用户的主屏幕上显示一个按钮，询问“你还好吗?。

If they don't press the button within 15 seconds, the companion is sent an alert.

如果用户15秒内没有按下按钮，指定的“同伴就会收到提醒。

The user is also given the option to call the police from within the app.

而在用户的应用中也会出现报警的选项。

Elsewhere, the app can detect if a person has been running, or headphones have been removed from the audio jack suggesting the phone has been dropped, for example.

此外，这款应用还可以检测一个人是否在奔跑，或者耳机是否从插孔里脱落，这可能表明手机已经掉了。

If this happens, the 'Are you OK?' button appears and the 15-second countdown starts automatically.

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