Subscription to extra features (such as sound) is an option for users.
用户可以选择，是否要添加额外功能（例如声音）。
These features can include additional multimedia such as video and sound.
这些功能包括附加的多媒体如视频和声音。
Features: All weather condition operation availability, sound, light and transmission alarming.
特点：全天候工作，具有声、光报警功能。
The new features all sound very impressive.
新特性令人印象深刻。
The new features all sound very impressive.
新特性令人印象深刻。
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