Dynamic drivers for stereo sound with powerful bassnLightweight and sleek steel headband for maximum durabilitynPortable design provides comfort for listening on the movenFrequency response: 22 ~ 18,000 Hz, Sound pressure level: 106 dB, Impedance: 32 Ohm, Total harmonic distortion: u0026lt;0.5% (1 kHz, 100 dB SPL)nDynamic drivers for stereo sound with powerful bass Frequency response: 22 ~ 18,000 Hz, Sound pressure level: 106 dB, Impedance: 32 Ohm, Total harmonic distortion: <0.5% (1 kHz, 100 dB SPL)