It introduces the functions and characteristics of railways telex automatic switch network, the volume control of telex network, operation guarantee of network and effects of network operation.

介绍了铁路电报自动交换网的功能特点，电报网的流量控制，网络运行保障及效果。

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The volume control circuit is composed of a programming switch and a computer storing magnifying executive circuit, and can realize the automatic alarming volume control.

音量控制电路由编程开关、电脑存储放大执行电路构成，可实现报警音量自动控制；

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The earpiece has an on-off switch, a three-stage volume control and uses a rechargeable battery.

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Both models feature a new capacitive touch control design that allows the listener to change volume, switch channels or jump streams with a simple swipe or tap.

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Software might be able to offer a good on-screen volume control option and it might be able to mitigate the off switch problem a little, but not enough to keep either issues from being extremely annoying.

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