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About product and suppliers:
        Alibaba.com offers 148,914 2-function products. such as free samples, paid samples. 

There are 148,412 2-function suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Japan, which supply 98%, 1%, and 1% of 2-function respectively. 

-function products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 34,102 with ISO9001, 19,602 with Other, and 5,146 with ISO14001 certification.