扩音电话是利用电话机与广播功能相结合，来实现远程调度、远程广播功能的电话机。由于在我国有很多工作环境都是特别恶劣、噪声特别大的，比如发电厂、进行爆破作业的矿山矿场、机场码头附近、噪声特别大的厂区等。当发生紧急情况之时，普通的电话或手机已经成为了摆设，如何能够快速与现场作业人员取得联系，如何实现远程调度都显得犹为重要。
布莱克博士与戴维斯都承认他们本人各有两台手机，但在耳机与扩音器的使用上相当慎重，并只在信号良好的的地方打电话。
Both Dr. Black and Davis admitted that they still own two cell phones each, but are careful to use a headset or speakerphone, and only make calls in areas with good reception.
据《纽约人》报道，瑞思考勒曾用手机打电话给希尔获取新闻消息并用扩音器指导员工疏散。
According to "The new Yorker," Rescorla used his cell phone to call Hill to get updates on news footage as he directed employees by bullhorn.
拥有一个听筒喇叭扩音器并没有什么了不起——直到您不得不拨打一个自动化电话系统。
Having a handset speakerphone may not seem like such a big deal-until you have to call an automated phone system.
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