The working principle of the door videophone
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Video call for a front door in an apartment. Video door phone. : The Working Principle Of The Door Videophone
Quote from Article entitled Video call for a front door in an apartment. Video door phone.:
When you press a call-button a signal arises and the photo or video recording of a visitor automatically begins. Seeing the man who came, you can talk to him, let him in or ignore the guest.
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