Dynamic sealed headphones provide excellent user comfort, a self-adjusting headband, pleasant fit, single cord and detailed sound. The 40 mm (1.6-in.) transducers and the unique Turbo Bass function for punchy low-frequency reproduction make the K55 the ideal choice for rock and pop music. Audio bandwidth: 16-20,000Hz. Sensitivity: 96dB. Impedance: 32 Ohms.