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Earphones, headsets, and Earpieces are a pair of conversion units that take radio signals from a media player or receiver and convert them into audible sound using speakers close to the ear. The earphone can be separated from the media player, and can be connected only with a plug. It can listen to the sound alone without affecting others. It can also block out the sound of the surrounding environment, which is very helpful for people who use in noisy environments such as recording studios, bars, travel and sports. Headphones were originally used for phones and radios, but with the popularity of portable electronic devices, they are used for mobile phones, walkmen, radios, portable video games and digital audio players.

From the development of the audio industry as a whole, wireless earphones are still a new thing, the development time is not long, in the rising period, user demand is constantly improving, users' expectations of wireless earphones are also improving, which is a new test for the industry. Some of the most important concerns for users include sound quality, battery life, wireless transmission capability and data latency. In terms of data, the wireless transmission capacity can basically meet the needs of the vast majority of users, while the sound quality and endurance capacity still have great potential for improvement. If we improve from these two points, we believe it will be easy to attract users' attention in the future. Headphones are the symbol of people's portable sound system. There are two types of headset standards: OMTP, which is often called the national standard, and CTIA, which is called the international standard. Earphones are classified according to their energy exchange modes, which mainly include moving coil mode, moving iron mode, electrostatic type and equal magnetic type. In terms of structure and function, it can be divided into semi-open and closed. There are earplug type, hanging ear type, in-ear type and headwear type. In terms of the number of wearers, there are single-person headsets and multi-person headsets. From the sound source difference, can be divided into active earphones and passive earphones; Active headphones are also often referred to as plug-in headphones.

The price range of headphones is a few yuan -- hundreds of thousands of yuan. The ordinary price is about 20 yuan, and the slightly better price is about 400 yuan. If it is a head type, the price is usually higher. Top headphones, such as the limited edition headphones produced by some top brands, can cost more than hundreds of thousands of yuan.

R for right, L for left. Moving coil type

Moving coil earphone is the most common and common earphone. Its driving unit is basically a small moving coil speaker, and the diaphragm connected to it is driven by the voice coil in the permanent magnet field to vibrate. Moving coil type earphone efficiency is relatively high, most can be driven by the earphone output on the stereo, and reliable and durable. Generally speaking, the larger the diameter of the driving unit, the better the performance of the headset. In consumer headphones, the maximum diameter of the driving unit is 70mm, which is generally flagship ear muzzle type headphones.