Building intercom Sichuan, Zhejiang and digital building visual intercom, Chongqing simulated home building intercom building intercom system product lines experienced a gradual evolution, and this series is in line with the process of development of the market requirements and the times trends, constantly incorporating new features to enrich the user needs. Eighties of last century, as imported goods entering the Chinese market, the development so far, has twenty years of sedimentation and accumulation, from the beginning of the delay in the development of the state is not up to today's residential real estate must be equipped with the device, it finally meet to own "little spring." It - is the building intercom system, a seemingly ordinary family essential tool not simple but functional. Say general, because it is for the general public, is not nothing strange products, and everyone in use. But in its general appearance hides the following simple but functional. Some might wonder, is not that a common intercom products Well, how simple function of that? This is because the building intercom in the development, has also been integrated into the new intelligent applications, so of course, also features "simple" was. That Next, we focus on and talk about the transformation from the product side of the road building intercom. If the technical development process to divide, China's building intercom products can be divided into four stages, namely: non-visual intercom - black and white video intercom - color video intercom - family intelligent terminal (or Digital video intercom). We can say that change is the four stages of the product realization from building intercom from ugly duckling to a beautiful swan transformation process. Non-visual intercom stage: This stage building intercom products, just enter China soon, due to the country's economy, the impact on national security awareness is weak and other factors, delays in the development of building intercom market is not up, the product also stay in the non-visual intercom stage. During this period the product features are relatively simple, just play a simple call and unlock other effects. Households can only make calls through the intercom system, according to the visitor's sound judgment and decide whether to open the door. Black and white video intercom stage: With the domestic needs of the people gradually, until there is no networking and product features are not visible already can not meet user needs, therefore, to the late 1990s, black and white video intercom system started by the majority of users favor, the market gradually into the intercom. The major products of this period is based on non-visual intercom before, an increase of camera and display, the development of black and white video intercom system. Households can not only hear the sound of visitors, visitors can see the image, greatly increasing the convenience. Color video intercom stages: a gradual increase with the further development of national living standards and technology, people have a higher quality of life for the pursuit, which makes color video intercom product development ushered in the spring. Color video intercom system appears, enabling clearer and more realistic picture screen. Therefore, during this period the product has continued to rise, sales increased remarkably. Compared to the black and white video intercom, color video intercom products more cost-effective, and thus, it will also continue to increase the proportion of the future. Family intelligent terminal stage: With the widespread application of smart phones and other mobile intelligent terminal, building intercom companies have also begun to respective control system embedded into a mobile intelligent terminal for remote operation. Therefore, this period tend to be more diversified product features and integration with smoke detector, gas detector, burglar alarm, infrared, door sensor, etc. combined, and thus play burglar alarm, emergency and other integrated functions , but also has a simple information dissemination functions, access control systems are gradually embedded into the intercom networks and devices. Above is the author of the building intercom product development path of a simple exposition Throughout these four stages, we can see that the building intercom product has undergone a gradual evolution, and this series is in line with the market process development requirements and trends of the times, constantly incorporating new features to enrich the user needs. We can say that twenty years of sedimentation allow building intercom has undergone a tremendous change in the country. Under the stimulus rigid demand, more products will be put into building intercom market. Unceasing development of the road, and we also look forward to the next phase of the new building intercom products soon appear.