While each box contains a beacon, the unit only has enough battery power to transmit a signal for 30 days.
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。
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"It will signal a dramatic shift to a cleaner, more sustainable method of providing frequency regulation on the grid," Beacon CEO Bill Capp told the GridWeek conference in Washington last week.