Contributing to their size are the installed microphone, speaker, and antenna. The devices also need a larger battery to power the complex functions of the phone.
内置话筒、扬声器、天线都使体积难以缩小，而这些新型装置也需要体积较大的电池来支持其复杂的功能。
I needed a battery for my wireless microphone.
我的无线话筒需要换个电池。
The microphone transmitter with a power indicated circuit, prompt to change the battery.
发射器具有电量指示电路，提示更换电池。
The microphone transmitter with a power indicated circuit, prompt to change the battery.
发射器具有电量指示电路，提示更换电池。
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