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About product and suppliers:
        Alibaba.com offers 123,971 heart rate products. About 26% of these are other mobile phone accessories, 1% are house-service detector tester, and 1% are air freight. 

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

There are 123,713 heart rate suppliers, mainly located in Asia. The top supplying countries are China (Mainland), United States, and Hong Kong, which supply 99%, 1%, and 1% of heart rate respectively. 

Heart rate products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 17,221 with ISO9001, 14,135 with Other, and 4,649 with ISO14001 certification.