Every drummer knows that earphones with such a feature are better than other devices on the market. But not all of them actually know what monitoring really means. Basically, monitoring is sound control. The monitor feature gives an accurate reproduction of the tonal qualities of the source audio, also meaning the lack of distortion. There are two types of monitoring: external and in-ear. For a drummer, monitoring can be organized in various ways: only external, only in-ear, or both at the same time.