名词
中文翻译：电子警报器
同义词：
['wireless alarm', 'electronic alert', 'digital alarm']
例句：
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1. The security system has a built-in electronic alarm that goes off when someone tries to break in.
这个安全系统内置了一个电子警报，如果有人试图闯入，它会发出警报。
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2. The elderly lady was so scared by the sudden electronic alarm that she ran out of the house.
那位老妇人被突然响起的电子警报吓得跑出了房子。
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3. The police used an electronic alarm to track down the thief.
警方使用电子警报来追踪小偷。