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About product and suppliers:
        Alibaba.com offers 11,665 simplex duplex products. About 1% of these are telecom parts, 1% are repeater, and 1% are wireless networking equipment. 

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

There are 11,665 simplex duplex suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of simplex duplex respectively. 

Simplex duplex products are most popular in South America, North America, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 3,896 with ISO9001, 1,028 with Other, and 622 with ISO14001 certification.