Anti-tangle Cable Made of Braided Kevlar Cord Double Damping System Filters Unwanted Sound Waves for Purest Sound Boosts Sound Performance and Stabilizing High and Low Frequency Effects Beryllium Alloy Diaphragm Product Design Award Xiaomi piston IF commemorative edition earphones support Android , iPhone iPod and iOS equipment. Dual-damping balance system make the sound more pure.  Aluminum sound chamber forming by diamond cutting Metal piston cavity design, can effectively reduce the resonant cavity adverse impact on the sound quality, a better bass performance CD pattern unique patented 3.5 mm gold-plated plug Prevent the plug contact surface oxidation, reduce signal transmission loss, restore a more realistic sound. Specification: Type: In-ear Material: PC ABS TPE Impedance : 16ohms Sensitivity: 93dB SPL  Frequency range 20-20000Hz  The maximum practical power: 5mW Cable Length: 1.2m Interface : 3.5mm Type of earphones: wire round Remote Control Material: Alloy Standard : EN50332-2 Earphones / mic with wire control Piston Design Earphones Headset Headphones Wire Control for Android , iPhone, iPod and iOS equipment. Weight : 15 gColor- Gold