1DD+4BA Hybrid Driver Units: 1 Dynamic and 4 Balanced Armature on each side, 10 drive units in total, integrating the wide sound field and high resolution, bringing deep bass and exciting treble. Comfortable Wearing Experience: In-ear headphones with 3 sizes of self-designed acoustic earcaps fit ear well, providing a long time comfortable wearing experience and great sound isolation. Detachable Replacement Cable: 2pin 0.75mm gold-plated needle plug design cable, detachable and replaceable. You can upgrade it with BT module (NOT included) and change it into BT headset. DIY your unique earphones. Strong Compatibility: 3.5mm gold-plated jack prevents oxidation and reduces signal loss, providing better audio restoration. Fits for almost all 3.5mm audio devices. Exquisite Design: Made of Aluminum alloy shell and imported resin material for a refined touch and look. Durable, exquisite, texture and fashion streamline aesthetics coexist.