Metal Gold - iSolator Screw Driver Hi-Fi Earphone / Headphone Clean bass-driven stereo sound, Excellent attenuation of ambient noise Extremely small and lightweight, Come with heavy duty metal housing and using metal instead of plastics,you'll experience less vibration and more of your music Come with spare Ear buds and Versatile ear buds fit comfortably in your ears IN-EAR designed, Frequency Response: 5Hz ~ 21kHz Impedance: 16 ohms, Sensivity: 110 dB /mw, Input Plug: 3.5mm stereo plug