In our present life, people can see headphones everywhere. No matter where you are, in the house, outside the door, all kinds of English listening examinations, it seems that the headphone is indispensable. From the invention of headphone to the present, it is developing with the advance of technology.

The headphone products are getting mature from the first two small speakers in your ears over time. Whether the type of headphones or wearing styles, even the pronunciation of the core unit, it has a lot of changes. This article will present the technical changes of headphone from the invention till now.

The original headphone is a two pronunciation units hanging on the edge of ears, up to now it has developed many types of headphones. Taking it by and large, including headphone, ear plugs, ear loop and the new development bone conduction headphones. Head wearing headphones are the first type of headphones. Comparing to the other type of headphones, it is poor in the express of undertone and is inconvenience in carrying.

Earplug is a revolutionary breakthrough in the development of headphone. The small size makes it very convenience to use outside. As urban developing, environmental noise increases, in-ear monitor is a new breakthrough product that be more suitable for the outside world applying. Ear loop can be regarded as an intermediate product of earphone and earplug. It is very beautiful in wearing. However, it does not have any clear characteristics. Bone conduction headphone is a relatively new technology, in the use of vibration theory, transmitting the sound through the skull to the listening center directly. However, this product is still not popular; it is indefinite whether it can bring to a revolutionary breakthrough for the headphone.

Open headphones generally bring a sense of comfort while listening, will not cause any pressure to the ears. It is applicable to enjoy music indoor. But this type of headphone has a great impact on the environment, with a certain regional limitation.

Closed headphones are widely used in the monitoring areas, it comes with a soft tone pad to wrap the ear, so the ear can avoid from being disturbed by the noisy environment in the process of listening music.

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