speaker-phone

基本解释

Whenever possible, use the speaker-phone mode or a wired headset (not a Bluetooth).
有可能的话，通话时尽量使用免提扬声模式或有线耳机（不是蓝牙）。
There she chatted, on speaker-phone, to her faraway mother, who said, of course, that it would be better if her daughter and grandchild stayed safe in the south.
她在厂里用免提电话跟远方的母亲聊天。当然了，她母亲说，如果女儿和外孙能够平安地呆在南方，那样更好。
Whenever possible, use the speaker-phone mode or a wireless Bluetooth headset, which has less than 1/100th of the electromagnetic emission of a normal cell phone.
可能的话，尽量使用扬声器模式或者无线蓝牙耳机，它将会小于标准手机辐射的百分之一。

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A speakerphone is a telephone that has a microphone and a loudspeaker, allowing you to talk to someone without putting the phone to your ear, as well as allowing other people to hear the person you are talking to.