警报器又称警笛警铃,是一种可以发出巨大噪音的装置。警报器一般安装在建筑内外某个固定的地方。当遇到自然灾害、火灾、恐怖袭击、外敌入侵时警报器就会发出声音。包括救护车警察车辆消防车在内的紧急服务车辆上也会安装警报器。

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警报器

历史

警报器据说是由约翰·罗比逊所发明。[1]

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参考文献

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