Features: Hybrid Dynamic and Armature Drivers: KZ ZST Pro adopts hybrid dynamic driver and balance armature driver unit, integrating the wide sound field and high resolution, bringing powerful dynamic bass and high sensitive treble. Comfortable Wearing Experience: Light-weight in-ear headphones with 3 sizes of silicone earcaps ensures a long time comfortable wearing. Ear-hook design reduces the burden to your ears. Detachable Repalcement Cable: Top high-quality environmentally audio cable with double 0.75mm gold-plated needle plug, soft and smooth, tangle-free and durable, excellent in appearence and performance. Strong Compatibility: 3.5mm Gold-plated jack prevents oxidation and reduces signal loss, providing better audio restoration. This earphones are designed for almost all 3.5mm audio devices. Suitable for Sports: Sports design guarantees 100% wearing stable and comfortable when walking, running, climbing, driving, hiking, cycling and other outdoor sports.