The HD 429s is a circumaural (over ear), closed back headphone that features an integrated mic for use with smart phones and tablets. The 32-ohm operating impedance is optimized for virtually all portable audio devices. The closed back design effectively isolates ambient environmental noise improving listening performance. High-output neodymium magnets help deliver powerful bass and overal smooth frequency response. The innovative, ergonomic design, is both durable and lightweight providing a comfortable fit for long listening sessions. The single-sided cable features a detachable intgrated mic with clip helping to reduce tangling if you're on the move. This headphone's combination of features and audio performance make it an exceptional value.