The large-diameter, high-quality ear pads are generously thick, providing a light and exceptionally comfortable fit. The HD599 model is a high-end model in the HD500 series, which employs the proprietary Ergonomic Acoustic Refinement (E.A.R.) technology. Type: Dynamic, Open-back Frequency Response: 12 ~ 38,500 Hz Impedance: 50Ω Sensitivity: 106dB Cable 1: 3.0m (single-sided, left), 6.3mm stereo standard plug (straight) Cable 2: 1.2m (single-sided, left), 3.5mm stereo mini-plug (straight)