The Internet of Everything (IOT) is currently the hottest Internet concept. Every day, new technology industries try to connect another home device to the network. For example, the doorbell is indispensable to all of us in the store, especially when guests visit, the number of visitors every day, etc. With the continuous development of technology, the intelligent doorbell is the general trend. One of the Internet of Things household devices is WiFi smart doorbell and smart phone APP to check visitors.
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