... Specification:1, 3.5mm connector 2.colour:many color to choose3.high quality and competitive price 4.Gifts & Premiums5 ... : America ,UK,Europe,middle east)Description1. colour: many colors to choose2. Frequency: 20-20,000HZ3. Sensitivity: 90dB4. Impedance: 16 ... Plug: silver-plated, straight, stereo plug10. With built-in button to click to switch from music listening to phone call answering and stopping