WK Wi90 In-Ear Headphones Ergonomically angled to fit your ear canal for long-lasting comfort Compatible with all Android, iOS and Mi devices Corrosion proof, scratch and slip resistant Play/pause and answer all calls with the press of a buttonRated output: 3mW Response Frequency : 20Hz--20kHz Sensitivity: 90±3db Wire length: 1200mm Impedance: 32Ω