Headphones (Earphones, Headphones, Head-sets, Earpieces) are a pair of conversion units that accept electrical signals from media players or receivers and convert them into audible sound waves using speakers close to the ears. Headphones can be separated from the media player and can be connected with only one plug, so that you can listen to the sound alone without disturbing others; you can also isolate the sound of the surrounding environment, which is very useful in recording studios, bars, travel, sports, etc. Helpful for those using in noisy environments. Headphones were originally used for telephones and radios, but with the prevalence of portable electronic devices, headphones are mostly used in mobile phones, walkmans, radios, portable video games and digital audio players. From the perspective of the development of the entire audio industry, wireless earphones are still a new thing. The development time is not long. It is in a rising period. User demands are constantly increasing, and users' expectations for wireless earphones are also increasing. This is the new development proposed by the industry. test. The main points that users are most concerned about include sound quality, battery life, wireless transmission capability and data transmission delay. From the data point of view, the wireless transmission capability can basically meet the needs of the vast majority of users, and the sound quality and battery life still have great potential for improvement.