Semi-Open Architecture With 2 Dynamic Drivers and 2 Balanced Armatures12mm Beryllium-Plated Diaphragm and 6mm Beryllium-Plated DiaphragmKnowles TWFK-30017 Balanced Armatures3 Sound Adjustment Switches for 8 different soundReplaceable Connectors: 2.5mm, 3.5mm and 4.4mm4 Cores 120 wires High Purity Monocrystalline Silver-Plated Copper Cable in Litz Type 2 StructureModelFH5sImpedance40ohmSound pressure level106dB/1KhzFrequency range10-40KhzMax Power100mWDrivers Config12mm/6mmBeryllium-Plated DiaphragmKnowles TWFK-30017 Balanced ArmaturesConnectorMMCXCableHigh Purity Monocrystalline Silver-Plated Copper CableNet WeightAbout 8.8g (Each Earbud only)AccessoriesHB5 PU Leather Carrying CaseEartips x13 PairsClean BrushMMCX Assist Tool