misc. talkback equipment ; intercom device
... Intercom: 内部通信联络系统 intercom device 对讲装置 INTERCOM INTERCOMmunicationsystem 内部通信系统 ...
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他也建议使用对讲装置或无线耳机以避免把手机放在耳朵上。
He also recommends using speakerphone or a wireless headset to avoid placing the phone on your ear.
该系列产品适用于电器、仪器、仪表和电子设备及自动化装置用电源线、控制线及信号传输线，具体可用于防盗报警系统、楼宇对讲系统等等用线。
Used as power cord, controlling wire and signal transmission wire for appliance, meter, apparatus, electric equipment and automatic device, anti - theft alarming system and building intercom system.
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