Sennheiser HD 4.30 headphones are compact, durable and foldable. The HD 4.30 features a detachable single-sided cable, which has a 3-button inline remote plus microphone. Optimised for either Apple iOS (HD 4.30i) or Android devices (HD 4.30G). Soft leatherette ear pads will keep out much of the noise around you as you listen to your music or the voice at the other end of the line• Impedance 18 Ω. • Frequency response 18 to 22000 Hz. • Sound pressure level 120 dB. • Total harmonic distortion <0.5% (1 kHz\/100 dB). • 3.5 mm straight plug. • Cable length 1.4 mDevice: . iPhone\/iPad\/iPod . Samsung Galaxy, LG, HTC, Sony, Other devicesHeadphone Style = Over EarFrequency Response = 18 - 22000 HzColour = BlackImpedance = 18OhmsSound Pressure Level = 120 (1 kHz\/1 Vrms)dBMaximum Frequency Response = 22000 HzMinimum Frequency Response = 18 Hz