A smart doorbell performs the main function of a video home intercom system — a call and a video conversation with the visitor. Using Wi-Fi makes it possible to connect to the Internet and allows the apartment’s owner, while away, to monitor everything that happens before the entrance door from his/her smartphone with Internet access. Besides, modern smart doorbells make it possible not only to photograph visitors, but also to record small videos to a memory card installed in them (usually not included), and the recording mode can be activated not only when the bell button is pressed, but also when a movement sensor is triggered.
Some models come with a color LCD display; most Hikvision and Dahua models provide for the possibility to connect an external monitor, and all doorbells make it possible to see the guest on a computer or smartphone screen.
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