R is right, L is left, it is the first letter of the word right (right), left (left).

On headphones:

R: right stands for right, meaning worn in the right ear

L: left stands for left, meaning worn in the left ear

Audio equipment labeled L/R is used in a two-channel (stereo) system, where the two-channel signals are recorded using a special technical method, and therefore require two-channel listening devices to be used in the restoration.

Simply put, record a sound effect of a horse running across the front of the dual-channel recording, with the correct L/R listening, you can hear that the horse is running from one side to the other, and if it does not meet the L/R requirements, you will hear other effects.

Dual-channel technology is the basis of the current so-called 2.1, 4.1, 5.1, 7.1 and other systems, which is commonly known as stereo, with a certain sense of three-dimensional space.

Earphones (Headphones; Headphones; Head-sets; Earpieces) are a pair of conversion units that accept electrical signals from a media player or receiver and convert them into audible sound waves using speakers close to the ear.

Headphones are generally detachable from the media player and are connected by a plug. The advantage is that you can listen to the audio alone without affecting others; you can also isolate the sound of the surrounding environment, which is helpful for those who use them in noisy environments such as recording studios, DJs, traveling, and sports.

The headset was originally designed for use on telephones and radios, but with the prevalence of portable electronic devices, headphones are mostly used for cell phones, Walkmans, radios, portable video games and digital audio players.

From the point of view of the development of the entire audio industry, wireless headset is still considered a new thing, the development time is not long, is still in the ascendant, the user demand continues to improve, the user's expectations of the wireless headset is also improving, which is the industry puts forward a new test.

Currently, users are most concerned about several points, including sound quality, battery life and wireless transmission capability, from the data point of view, the wireless transmission capability has basically been able to meet the needs of the vast majority of users, while the sound quality and battery life there is still a lot of potential to improve, if you start from the two points of enhancement, I believe that in the future it will be very easy to attract the user's eyeballs.

Reference:

Headphones (technology products) Baidu Encyclopedia