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About product and suppliers:
        Alibaba.com offers 3,214 duplex intercom products. About 65% of these are other motorcycle accessories, 10% are video door phone, and 3% are walkie talkie. 

A wide variety of duplex intercom options are available to you, such as paid samples, free samples. 

There are 3,214 duplex intercom suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of duplex intercom respectively. 

Duplex intercom products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 875 with ISO9001, 670 with Other, and 13 with ISO14001 certification.