Anti-tangle Cable Made of Braided Kevlar CordDouble Damping SystemFilters Unwanted Sound Waves for Purest SoundBoosts Sound Performance and Stabilizing High and Low Frequency EffectsBeryllium Alloy DiaphragmProduct 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 cuttingMetal piston cavity design, can effectively reduce the resonant cavity adverse impact on the sound quality, a better bass performanceCD pattern unique patented3.5 mm gold-plated plugPrevent the plug contact surface oxidation, reduce signal transmission loss, restore a more realistic sound.Specification:Type: In-earMaterial: PC+ABS+TPEImpedance : 16ohmsSensitivity: 93dB SPL Frequency range 20-20000Hz The maximum practical power: 5mWCable Length: 1.2mInterface : 3.5mmType of earphones: wire roundRemote Control Material: AlloyStandard : EN50332-2Earphones / mic with wire controlPiston Design Earphones Headset Headphones Wire Control for Android , iPhone, iPod and iOS equipment.Weight : 15 g