Size: 152*185*90mm Speaker: Φ53 mm Impedance: 64±15%Ω Sensitivity: 110dB ± 3dB Frequency response: 20 hz to 20khz Microphone: Ø6.0×2.7mm Operating current: ≤ 80mA cord Length: 1.7m Plug: 3.5mm 4pole