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See Chinese contents: GB/T 14471-2013 GB/T 14471-2013: General specification for headphones
This standard specifies the classification, naming and coding of headphones; the requirements on inspection items, technical requirements, test methods and inspection rules about headphone products; and other requirements including product information, packaging, transport and storage. This standard is applicable to headphones - microphone set (headphone - telephone transmitter) and headphones used on and inside of human ears. In addition, this standard is also applicable to the composite parts necessarily required for constituting a complete headphone system, such as pre-amplifier, passive network and power supply. This standard is not applicable to wireless headphones or noise cancelling headphones.
