The sound quality design is based on the results of psychology research. Clear sound quality makes music fun Equipped with a final's first controller with microphone. We conducted sound quality design based on the results of the latest acoustic engineering and psychology. Using the general sound making method of emphasizing a part of the treble, you can hear and feel the vibrancy of the sound, but this will result in a buried range of other sounds, making it difficult to hear. The E2000C does not produce an emphasized sound range, resulting in clear sound quality. Furthermore, the treble has a slight feature, so you can experience the immersive feeling of playing in front of your eyes. This product aims to be called a "classic" that feels better than an appeal, for a long time, and is designed to make music more enjoyable. In order to meet the needs of "want to enjoy music with a smart phone, the E2000C is equipped with a controller that can be played, pause, rewind, forward, and answer incoming calls with one button of the remote control on the hand and a microphone that supports hands-free calls.