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About product and suppliers:
        Alibaba.com offers 50,313 door intercom products. About 49% of these are video door phone, 4% are access control system, and 3% are alarm. A wide variety of door intercom options are available to you, such as paid samples, free samples. There are 49,751 door intercom suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Hong Kong, which supply 97%, 1%, and 1% of door intercom respectively. Door intercom products are most popular in North America, Western Europe, and Northern Europe. You can ensure product safety by selecting from certified suppliers, including 10,442 with ISO9001, 3,330 with Other, and 703 with ISO14001 certification.
        
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