The HD HD669 are closed-back, circumaural headphones designed for professional monitoring applications. Although suitable for a very wide range of applications, the exceptional attenuation of external noise makes the HD 669 particularly useful for use in a high-noise environment. The balanced, high definition and clarity sound of the HD-669 assures that a professional sound engineer can have full confidence when recording or monitoring. Its patented sturdy headband structure provides long-lasting durability even in challenging conditions, yet its light weight and optimized mechanical pressure provides long-term wearing comfort. The HD669 comes equipped with 2 detachable straight cables: The short cable is 1 meter long for personal sound source on-the-move applications and the long cable is 3 meters long for professional monitoring applications. These cables can be connected together for even more distance if desired. Included cable clip can secure detachable cable from pulling out by incident. Closed back professional headphones High res drivers Good in high noise environment Suitable for wide range of applications Balanced, high clarity sound