In ear monitors, or earphones, are used for personal playback of audio for one specific individual to hear. These discrete earphones or earbuds are usually wired to the source of their audio playback, but can also be wireless by using Bluetooth technology. In ear monitors come in sets of 2, with 2 small output elements like small speakers that are designed to be inserted into the outside of an ear canal. One earbud goes in each ear, and then, when the audio playback starts, the person wearing the in ear monitors hears the audio in stereo across both ears. Being able to listen to audio closely in both ears provides a great listening experience.