... diameter: Φ30mm;Speaker impedance: 32Ω;Frequency response range: 20HZ 20000HZ;Headphone sensitivity: 105dB S.P.L at 1KHz;Rated power: 20MW ... speakers, pure sound;4, non-toxic environmentally, halogen-free TPE cable, durable and tactile;5, metal microphone, facilitate dialogue;6,3 ...