它显示了在一个特定的时间点存在多少跟踪器，以及是否需要更多。
It shows how many trackers exist at a certain point in time, and whether you need more.
在同一时间，您的朋友发送文字说明你的GPS跟踪器让他们的确切位置。
At the same time, your friends send text instructions to your GPS tracker which gives them your exact location.
在同一时间，您的朋友发送文字说明你的GPS跟踪器让他们的确切位置。
At the same time, your friends send text instructions to your GPS tracker which gives them your exact location.
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