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About product and suppliers:
        Alibaba.com offers 15,057 transponder products. About 54% of these are keys, 10% are access control card, and 1% are fiber optic equipment. 

A wide variety of transponder options are available to you, 

There are 14,509 transponder suppliers, mainly located in Asia. The top supplying countries or regions are United States, China, and Hong Kong S.A.R., which supply 1%, 98%, and 1% of transponder respectively. 

Transponder products are most popular in United States, Australia, and Brazil.