Material : PP * Color : Black ( no silver color on the earpiece ) * Plug: 3.5mm stereo straight plug , silver plated * Headband : retractable * Cable length : 1.0M ¡À 10% (3.5 feet ) * Speaker : 30 mm * Impedance : 32 ohms * Frequency range : 20-20,000 Hz * Magnet : Ferrite * Rated Power Input: 40mW * Max. Power : 100 mW * Sensitivity: 108 ¡À3dB/mW at 1KHz * Channel unbalance : < 3 dB. * Distortion Rate:
