The lowpressurealarm device is capable to remind workers to charge the accumulator in time;
低压报警器可以提醒作业人员及时对蓄电池充电；
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Similarly, high-level events can be decomposed into one or more low-level events or actions; for example, changing a pressure control valve, sounding an alarm, or signaling an alert.
Tire pressure monitor system (TPMS) is mainly used to monitor tire pressure when running and alarm the leakage and lowpressure of tire, so it is a safeguard to drivers and passengers.