如果延迟减缓，你只有以丢包的方式才能赶上，因为你不能以高于实时的速度回放音频而没有察觉。

If latency decreases, you can only catch up by dropping packets, since you can't play back audio at more than real-time speed without noticing.

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LED设备可以滚动播放字母或者简单的图片，而扬声器可以回放音乐、声音或者事先由朋友家人录制的讯息。

The display can show scrolling text or simple images and the speakers can replay music, sounds or pre-recorded messages from friends or family.

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