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Earphones (headphones; head sets; earpieces) are a pair of conversion units, which accept the electrical signals from the media player or receiver, and use the speakers close to the ear to convert them into audible sound waves. Headphones are usually detachable from the media player and connected with a plug. The advantage is that you can listen to the sound on your own without affecting others. You can also separate the sound of the surrounding environment, which is very helpful for people who use it in noisy environment such as recording room, bar, journey, sports, etc. Earphones were originally used for telephones and radios, but with the popularity of portable electronic devices, earphones are mostly used for mobile phones, Walkman, radios, portable video games and digital audio players.

From the perspective of the development of the entire audio industry, wireless headphones are still a new thing. The development time is not long. At present, they are still in the rising period. The user demand is constantly increasing, and the user's expectation of wireless headphones is also increasing. This is a new test for the industry. At present, the key points that users are most concerned about include sound quality, endurance and wireless transmission capacity. From the data point of view, wireless transmission capacity can basically meet the needs of the vast majority of users, while sound quality and endurance capacity still have great potential to improve. If these two points are improved, it is believed that it will be easy to attract users' attention in the future. [1]