本文介绍了无线可视双向对讲门铃的市场应用，并给出了一种无线可视双向对讲门铃的设计。
Based on the wide application of the wireless visible talkback doorbell, this paper describes a method to realize this system.
本文介绍了无线可视双向对讲门铃的市场应用，并给出了一种无线可视双向对讲门铃的设计。
Based on the wide application of the wireless visible talkback doorbell, this paper describes a method to realize this system.
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