... headphones and high quality for mass purchase.10. Sells to all over the world .(Main market : America ,UK,Europe,middle east) ... Product description1. colour: many colors to choose2. Frequency: 20-20,000HZ3. Sensitivity: 90dB4. Impedance: ... the ear, closed, daynamic9. Plug: silver-plated, straight, stereo plug10. With built-in button to click to switch from music listening to ...