Perfectly portable, these ear buds come in fun, bold colors. Microphone included for added functionality. Interchangeable ear buds for comfort and protective plastic case. Works with most mobile devices. Frequency Range: 20-20,000 hz - - Maximum Power: 5mW - - Sensitivity: 108+/-5dB at 1000 hz - - Impedance: 32 ohm ±15% - - Plug: 3.5mm stereo pin.