Well suited for professional DJs seeking sound intensity and bass, the Koss UR20 Full Size noise isolating headphones are every bit as well suited for any music lover. Designed to endure the rigors of a recording session, these closed headphones just as easily enhance typical listening sessions. With an extended frequency response, closed leatherette ear cushions and great sound, the lightweight UR20 noise isolating headphones are suitable for any level of music enthusiast. Specifications: Frequency range: 30-20,000 Hz, impedance: 32 Ohms, Sensitivity: 97dB SPL