Dunu Crius DN-13 Compact IEM Metal Finish Balanced Armature Earbuds Loaded with high grade full frequency unit, it enhances the detailed of bass and presents crisp and crystal in mid and treble. It also provides you the high sound quality and the best recognition. The earphone is designed with highly covered and sound leaking proof which can block the outer noises and only preserves the sound you desire. Multilayer-membrane design helps reducing the excess vibration that may cause distortion to achieve first-class quality. With broad dynamic frequency ULTRA driver unit, it makes the sound quality even perfect.