Rock Earphones Wired Headphones In Ear Stereo Noise Isolating Zircon Earbuds with Microphone and Volume Control for Sports Running 3.5mm Jack for In-line Control 1.2M (Black) EXCELLENT SOUND: The cavity is made of nano zircon, which features crystal clear, high density, high hardness and excellent distortion-free sound IMPORT COMPOMENTS: With the match of copper-clad aluminum voice coil and high-performance magnet, it performs distortion-free sound and better ductility of crisp highs ERGONOMIC DESIGN: It is small and the oblique angled conduit of ergonomic design, comfortable to wear and ensures fantastic bass effect DUARABLE CABLE: The braided composite cable is flexible and anti-winding with long service life, it also can reduce microphony noise ,environmentally friendly STRICT TEST: It has passed various strict reliability tests, such as low & high temperature test, temperature & humidity test, bending test, tensile test, plug test, drop test and impact test, etc