About Product:March 2018: time to market supply of goods categories: physical types: wireless headset type: headset wearing way: headset output audio source: general plug diameter: 3.5 mm plug type: if the bluetooth wireless headset: both with and without the microphone: there are voices: moving coil frequency response range: 20-20000 (Hz) impedance: 32 (Ω) sensitivity: 105 (dB) distortion rate: 2 (%) wire length: 1.2 (m) trumpet diameter: 40 mm) (Φ earplugs/ear cover material: the eggs