About Product:2018: time to market supply of goods categories: spot type: wireless headset type: headset wearing way: headset output audio source: communications equipment plug diameter: wireless plug type: if the bluetooth wireless headset: both with and without the microphone: there are voices: moving coil frequency response range: 20-200000 (Hz) impedance: 32 (Ω) sensitivity: 105 (dB) distortion rate: 2 (%) wire length: 1.2 (m) trumpet diameter: 40 mm) (Φ earplugs/ear cover material