Earphones with 3mW Rated Power and 3.5mm Plug, Suitable for Apple's iPod/iPhone Driver unit: 10mm Maximum input power: 100mV Impedance: 32 ± 2Ω Sensitivity: 108 ±2dB Frequency response: 20 to 20kHz Cord: 1.2 ± 0.2m Plug: 3.5mm iPod, iPad and iPhone are trademarks of Apple Inc.