Sony MDR1A Premium Hi-Res Stereo Headphones (Black) Sound Reproduction up to 100 kHz, 40 mm driver units with ALCP for articulate audio reproduction, 4-conductor cable for better signal separation and resulting sound quality, Ergonomic ear pads for powerful response and long-term comfort.Connectivity Technology: Wired Compatible with 3 optional cables engineered with Kimber Kable, Silver coated OFC cable minimizes signal transmission loss, Beat Response Control for improved bass and transient response, Enfolding structure for wrap-around feel and improved acoustic seal Inward axis structure delivers optimum fit, Silent joints won't disturb your audio experience, In-line remote and microphone for hands-free phone calling, Carrying pouch and cord length is 3.94 feet Sensitivities (dB/mW): 105 dB/mW