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About product and suppliers:
        Alibaba.com offers 2,223 headphone unit products. About 9% of these are speaker, 1% are educational equipment, and 1% are other refrigeration & heat exchange equipment. 

A wide variety of headphone unit options are available to you, such as home theatre, stage, and computer. You can also choose from passive, active. As well as from portable, mini, and wireless. And whether headphone unit is 1, 2 (2.0), or 3 (2.1). 

There are 2,223 headphone unit suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of headphone unit respectively. 

Headphone unit products are most popular in North America, Western Europe, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 674 with ISO9001, 196 with Other, and 33 with BSCI certification.