虽然每个盒子里都有一个信标，但这个装置的电池只能够传输30天信号。
While each box contains a beacon, the unit only has enough battery power to transmit a signal for 30 days.
当 VBAT 超出其工作范围时，将监视电池输入并激活故障信号。
Battery input is monitored and a fault signal becomes active when VBAT is out of its operative range.
至于类如无线信号、电池电量等状态信息则被显示在其中一块屏幕的边沿。
Statuses, like wireless signal and battery life, are displayed along the rim of one of the screens.
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