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About product and suppliers:
        Alibaba.com offers 18,840 40mm speaker products. About 59% of these are speaker, 15% are acoustic components, and 7% are earphone & headphone. 

A wide variety of 40mm speaker options are available to you, such as speaker, buzzer, and receiver. You can also choose from free samples, paid samples. 

There are 18,810 40mm speaker suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and United States, which supply 99%, 1%, and 1% of 40mm speaker respectively. 

0mm speaker products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 8,130 with ISO9001, 3,104 with Other, and 656 with ISO14001 certification.