... : moving coil headphonesWear mode: head typeFunction purpose: bluetooth headset, wireless headset, voice headphonesUnit diameter: 40 mmFrequency response range: 20- ... 3.6 VOther parametersAppearance design: white, purple, and blackOther features: 1, wireless bluetooth super receiving range 10-15 m;2 ... in a variety of ways to facilitate your work and life;3, active noise reduction to eliminate noisy ...