The other name of the video doorbell is "video door phone"
In nowadays, the visual bell as a convenient and practical product, ranging from the late nineties to now, mainly used in commercial , the scale development is rapid, of universal applicate in high-rise residential buildings now in the urban district. when use, household heard the ring, receive the call visitors through the door host downstairs and engage in dialogue like video phone calls, while the host camera to receive video images in the visual extension through the downstairs, households observe the image display on the monitor extension to confirm the identity of visitors and finally decide whether to press the unlock button on indoor extension connect the host electric door locks to open the door, to allow visiting guests to enter.
Visual doorbell, using in one or more buildings in a residential building, when a number of households shared a door host, usually known as video intercom systems, building visual intercom systems; and used in single households, such as villas, often known as single-family video door phone or villa video doorbell.
Video doorbell already widely used in urban housing around the world current, its manufacturers concentrated in cities with relatively well-developed industry in security precautions, Guangzhou in Guangdong Province, Shenzhen of China, and Xiamen in Fujian Province and other cities in China.
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