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About product and suppliers:
        Alibaba.com offers 3,140 duplex intercom products. About 64% of these are other motorcycle accessories, 10% are video door phone, and 2% are walkie talkie. 

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

There are 3,140 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 749 with ISO9001, 700 with Other, and 11 with ISO14001 certification.